How to keep the MIG welding wire storage and very long time 1. The warehouse where the welding wire is stored should have a dry and ventilated environment to avoid moisture; liquids such as water, acid, alkali and other liquids are highly volatile. There are corrosive substances, and it is not suitable to coexist with these substances in the same warehouse. 2. The welding wire should be placed on the wooden pallet, not directly on the floor or close to the wall. 3. Be careful not to break the packaging when accessing and transporting the welding wire, especially the inner packaging "heat shrinkable film". 4. After opening the welding wire package, it should be used up as soon as possible (required within one week). Once the welding wire is directly exposed to the air, its anti-rust time will be greatly shortened (especially in humid and corrosive environments) 5. Distribute welding wire in accordance with the principle of "first in, first out" to minimize product inventory time. 6. Please store according to the type and specification of welding wire to prevent misuse.

Many friends think that as long as a worker is a welder, he can weld anything. But this is not the case. There are specialized welders in each field, and their work is mainly divided into welding four types of steel. Which are there? I represents a class of steel: belongs to carbon steel The carbon content is less than 1.35% (0.1%~1.2%), and it does not contain other alloying elements except iron, carbon and impurities such as silicon, manganese, phosphorus and sulfur within the limit. The properties of carbon steel mainly depend on the carbon content. When the carbon content increases, the strength and hardness of the steel increase, and the plasticity, toughness and weldability decrease. Compared with other steels, carbon steel is the earliest used, with low cost, wide performance range and the largest amount. It is suitable for media such as water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure PN≤32.0MPa and temperature of -30℃~425℃. Commonly used grades are WC1, WCB, ZG25 and high-quality steel 20, 25, 30 and low-alloy structural steel 16Mn. Ⅱ represents the second-class steel: it belongs to low-alloy steel Alloy steel with less than 5% of total alloying elements is called low alloy steel. Low alloy steel is relative to carbon steel. On the basis of carbon steel, in order to improve one or more properties of steel, one or more alloying elements are intentionally added to steel, and the amount of alloy added exceeds When carbon steel has a general content in the normal production method, this steel is called alloy steel. When the total alloy content is less than 5%, it is called low alloy steel; when the alloy content is between 5% and 10%, it is called medium alloy steel; if it is greater than 10%, it is called high alloy steel. Ⅲ represents three types of steel: it belongs to martensitic stainless steel, ferritic stainless steel The standard martensitic stainless steels are: Types 403, 410, 414, 416, 416(Se), 420, 431, 440A, 440B, and 440C, which are magnetic; the corrosion resistance of these steels comes from chromium, which ranges from 11.5%~ 18%, steel with higher chromium content requires higher carbon content to ensure the formation of martensite during heat treatment. The above three Type 440 stainless steels are seldom considered for applications requiring welding, and the type 440 composition is not readily available. Ferritic stainless steel (400 series) has a chromium content of 15% to 30% and has a body-centered cubic crystal structure. This type of steel generally does not contain nickel, and sometimes contains a small amount of Mo, Ti, Nb and other elements. This type of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. It is mostly used in the manufacture of atmospheric resistance. , Parts corroded by water vapor, water and oxidizing acid. The price of ferritic stainless steel is not only relatively low and stable, but also has many unique features and advantages. It has been proved that ferritic stainless steel is an extremely high-quality stainless steel in many applications that were originally considered to be only austenitic stainless steel (300 series). Excellent alternative material. Ferritic stainless steel does not contain nickel. The main elements are chromium (>10%) and iron. Chromium is a particularly corrosion-resistant element for stainless steel, and its price is relatively stable. Ⅳ represents four types of steel: austenitic stainless steel, duplex stainless steel Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When the steel contains about 18% Cr, 8%~10% Ni, and about 0.1% C, it has a stable austenite structure. Austenitic chromium-nickel stainless steel includes the well-known 18Cr-8Ni steel and high Cr-Ni series steel developed on this basis by increasing the content of Cr and Ni and adding Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low, and it is impossible to strengthen it through phase transformation. It can only be strengthened through cold working. If elements such as S, Ca, Se, Te are added, it has good Machinability. Duplex Stainless Steel (DSS for short) refers to stainless steel with about 50% of ferrite and 50% of austenite, and generally less than 30% of the content of the less phase. In the case of low C content, the Cr content is 18%~28%, and the Ni content is 3%~10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N. This type of steel has the characteristics of both austenitic and ferritic stainless steels. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, and significantly improved intergranular corrosion resistance and welding performance. The 475 ℃ brittleness and high thermal conductivity of element stainless steel have the characteristics of superplasticity. Compared with austenitic stainless steel, it has high strength and significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel.

In the process of aluminum alloy welding, due to the different types, properties and welding structures of materials, various cracks can appear in the welded joints, and the shape and distribution characteristics of the cracks are very complex. According to their generated parts, they can be divided into the following two types of cracks form: (1) Cracks in weld metal: longitudinal cracks, transverse cracks, crater cracks, hair or arc cracks, root cracks and microcracks (especially in multi-layer welding). (2) Cracks in the heat-affected zone: weld toe cracks, laminar cracks and microscopic thermal cracks near the fusion line. According to the temperature range of crack generation, it is divided into hot crack and cold crack. Hot crack is generated at high temperature during welding, which is mainly caused by the segregation of alloy elements on the grain boundary or the existence of low melting point substances. Depending on the material of the metal to be welded, the shape, temperature range and main reasons for the occurrence of hot cracks are also different. Hot cracks can be divided into three categories: crystallization cracks, liquefaction cracks and polygonal cracks. Crystallization cracks are mainly produced in hot cracks. During the crystallization process of the weld, near the solidus line, due to the shrinkage of the solidified metal, the residual liquid metal cannot be filled in time. Intergranular cracking occurs under the action of solidification shrinkage stress or external force, which mainly occurs in carbon steel, low alloy steel welds and some aluminum alloys with more impurities. Liquefaction cracks are generated under the action of shrinkage stress during solidification of grain boundaries heated to high temperatures in the heat-affected zone. During the test, it was found that when the surface of the filler material was not sufficiently cleaned, there were still many inclusions and a small amount of pores in the weld after welding. In the three sets of tests, since the welding filler material is a casting structure, which contains high melting point substances, it will still exist in the weld after welding, and the casting structure is relatively sparse and has many holes, which is easy to absorb the components and oil containing crystal water. quality, they will be a factor in the generation of porosity during the welding process. When the weld is under tensile stress, these inclusions and pores often become the key sites for inducing microcracks. Further observation by microscopy revealed that there was a clear tendency for these inclusions and pore-induced microcracks to intersect with each other. However, it is still difficult to judge whether the harmful effect of the inclusions is mainly manifested as a stress concentration source to induce cracks, or it is mainly manifested as a brittle phase to induce cracks. In addition, it is generally believed that pores in aluminum-magnesium alloy welds do not have a significant impact on the tensile strength of the weld metal. phenomenon of cracks. Whether the phenomenon of porosity-induced microcracks is only a secondary phenomenon or one of the main factors causing a substantial decrease in the tensile strength of welds remains to be further studied.

Last week,our Iran friends Mr Farbod visited us. He has done the business of MIG welding wire,flux cored welding wire for more than 15 years jn Iran. He said,he will buy a lot of Welding wire,flux cored welding wire,stainless steel welding wire from our factory. We have discussed for more details of business and technical,and gave the gifts for each other.

Today,one of the biggest customers visited our factory,they will buy big quantity of Welding wire from us. They will also be our overseas agency in Southern Asia.We are warmly welcome the friends to discuss technical,to visit our factory.

Welding wire is a kind of metal product. Although most of the surfaces of cored wire and seamless flux cored wire are copper plated, the surfaces of some seam cored wires are rust proof (such as chemical blackening).. In addition to plastic bags, all the bags are packed with a moisture-proof agent, which is wrapped in paper boxes. However, moisture-proof is still a problem that must be considered in the management of welding wire protection. Because it is a hygroscopic welding wire, the content of diffusible hydrogen in the deposited metal can be increased, resulting in pits, pores and other defects. The welding process performance and mechanical properties of the weld metal become worse, which can lead to weld cracking strictly, which is the same as other welding materials. Of course, since the powder in the drug cored welding wire is tightly wrapped in the steel strip, the drug powder is in contact with the air very much, and at the same time, the water glass in the electrode is not used as a moisture absorbing substance. Therefore, compared with the welding rod, the amount of moisture absorption of the welding wire is very small. However, if the welding wire is placed in a high temperature and high humidity environment for a long time, it will also absorb moisture except for rust on the surface of the welding wire.. With the increase of moisture absorption time and amount, the amount of diffusible hydrogen in the deposited metal gradually increases, which answers that the tear resistance of the weld is unfavorable. Management requirements for welding wire ① It is required that under the recommended storage conditions, the original unpacked welding wire can be kept "fresh in the factory" for at least 12 months. Of course, the maximum storage time depends on the ambient atmospheric environment (temperature, humidity, etc.).. Recommended storage conditions of the warehouse: room temperature is above 10~15 ℃ (the highest ℃), and the maximum relative humidity is 60%. ② The welding wire shall be stored in a dry and well ventilated warehouse. It is not allowed to store it in the open air or indoors with harmful gases and corrosive media (such as SO2). The interior shall be kept clean and tidy. When stacking, it should not be directly placed on the ground. It is better to place it on the shelf or base plate that is not less than 300mm from the ground and wall to protect air circulation and prevent moisture. ③ There are many welding methods and steel types applicable to the welding wire, so the shape of the welding wire coil and the bundling status are various. According to different wire feeders, the shapes of rolls can be divided into disc, bundle and cylinder. Therefore, during the transportation, it is necessary to avoid littering and packing damage. Once the package is damaged, the welding wire may absorb moisture and rust. be careful Bundle welding wire shall not be loaded into wire feeder to prevent deformation of wire rack. Cylindrical welding wire shall not be rolled during handling, and the container shall not be put down or tilted to avoid winding of welding wire in the cylinder and hindering use. Management of welding wire in use ① The welding wire shall be used up within 2 days after unpacking. ② After unpacking, the surface of the welding wire shall be protected from condensation and condensation, and some of it shall be polluted by rust, grease and other hydrocarbons, so as to protect the surface of the welding wire from being clean and dry. ③ When the welding wire is used up and needs to be put in the wire feeder overnight, the wire feeder (or wire reel) shall be covered with canvas, plastic cloth or other articles to reduce the contact with moisture in the air. ④ The welding wire that cannot be used for more than 3 days shall be removed from the wire feeder. Put it back into the original package, seal it, and then put it into the warehouse with good storage conditions. Quality management of welding wire ① Each batch of welding wire purchased shall have the manufacturer's quality assurance certificate. The qualified products must be accompanied with product manual and inspection certificate in each package. The inner package of each welding wire shall be marked with a label or other methods to indicate the welding wire model and corresponding national standard number, batch number, inspection number, specification, net quality, manufacturer name and former address. ② The welding wires shall be stacked separately according to their types and specifications to prevent misuse. ③ The welding wire shall be handled according to the principle of "first in, first out" to minimize the storage period of the welding wire. ④ If the package of welding wire is damaged, it shall be carefully checked. The welding wire with obvious mechanical damage or excessive rust trace shall not be used for welding. It shall be returned to the inspector or technical debtor for inspection and use approval. Drying of welding wire Drying is a common problem in the use of welding rods, but for welding wires, there is no clear mention in the existing literature and product descriptions. This shows that it is usually unnecessary to dry the welding wire before welding. In the actual construction, some people think that the welding wire which is strictly affected with damp can also be dried, but the temperature should not be too high. Generally, it can be dried for 1~2h at 120~150 ℃. This is beneficial to the elimination of pores and the reduction of diffusible hydrogen content.

Wire China in November 2022 and to meet the international pavilion | nanjing international expo center Due to the consolidation of the epidemic prevention and control in Shanghai, the 10th China International Cable and Wire Exhibition, which was scheduled to be held at Shanghai New International Expo Center from September 26 to 29, 2022, has been determined by comprehensive analysis and full consultation. Will be held at Nanjing International Expo Center (300 Jiangdong Middle Road, Jianye District, Nanjing) from November 8 to 11, 2022. The current Wire China will continue the previous product line, covering cable, wire manufacturing and finishing machinery, fastener and spring manufacturing equipment, auxiliary processing equipment, finished wire, wire and cable and raw and auxiliary materials, measurement and control technology and testing engineering and other fields. nanjing As an important hub at the intersection of the Belt and Road Initiative and an important node city along the Yangtze River Economic Belt, it is a national comprehensive industrial production base and a pilot and demonstration city of the "Made in China 2025" initiative. Nanjing is building a leading industrial development system of "advanced manufacturing + modern service + future industries", and has gathered key landmark industries such as new energy vehicles, integrated circuits and artificial intelligence. It is an important platform for the opening up and cooperation of the Yangtze River Economic Belt. wire China 2022 We will fully combine the resources advantages of the Yangtze River Delta to promote the exhibition, invite visitors, match businesses and organize activities, so as to bring high-quality exhibition experience to colleagues in the industry. "Made in China 2025 nanjing implementation plan", will implement intelligent upgrade plan of manufacture equipment and intelligent demonstration plant construction, promote enterprise equipment digitization, network, intelligence, to facilitate industry in high-end, the key to promote petrochemical, automobile and rail transit, nc machine tools, aviation facilities, high-end equipment manufacturing fields such as industry chain collaboration, Building a number of influential industrial clusters in the Yangtze River Delta. At the same time, China will promote the technological upgrading and intelligent transformation of the wire and cable industry. Since the beginning of this year, the installation of offshore wind power, photovoltaic and other new energy has accelerated, and the superimposed power grid has increased investment, and the demand for cables has further increased. The approved capacity of offshore wind power in Jiangsu ranks the first in China. During the 14th Five-Year Plan period, Jiangsu Development and Reform Commission publicized the "14th Five-Year Plan for Offshore Wind Power in Jiangsu Province", which planned 28 offshore wind power project sites with a scale of 9.09GW and a planned total area of 1,444 square kilometers, corresponding to an annual installed capacity of about 1.8GW. The development of offshore wind power has driven the development of the submarine cable industry in Jiangsu Province.

Flux function Similar to the coated electrode, the flux cored wire manufacturer has its own formula for the flux composition. The flux composition varies with the function of the welding material. The basic functions of flux components are outlined below: (1) Deoxidizer and nitrogen remover Since nitrogen and oxygen can cause pores or embrittlement of the weld metal, deoxidizers such as manganese and silicon must be added to the flux. As for the self-shielded flux-cored wire, AL should be added to the flux as a denitrification agent. The purpose of adding oxygen scavenger and nitrogen scavenger above is to purify the molten metal. ⑵ Welding slag forming agent Calcium, potassium, sodium or silicon are all welding slag forming agents. Adding to the flux can effectively protect the molten pool from atmospheric pollution. The welding slag can make the welding props have a better appearance and can support full-position welding after rapid cooling. molten pool. The coverage of the slag can further moderate the cooling rate of the filler metal, which is especially important for the welding of low alloy steels. (3) Arc stabilizer Sodium and potassium keep the arc soft and smooth and reduce spatter. ⑷Alloying elements The addition of alloying elements such as molybdenum, chromium, carbon, manganese, nickel and vanadium can increase (improve) the strength, ductility, hardness and toughness of the molten metal. ⑸ Gas former Fluorspar, limestone, etc. need to be added to the self-shielded flux-cored wire to burn to generate shielding gas. ⒊2 Types of welding slag The composition of the flux determines the welding workability of the welding material and the mechanical properties of the filler metal. If the composition of the flux is mainly acidic, acid slag will be generated after welding. Similarly, the alkaline (lime) flux will produce alkaline welding. scum. The welding material of the acid system is very good in weldability. During the welding process, the arc is smooth and stable, the shape is similar to the jet arc, and the amount of spatter is small. Welding consumables whose flux is an alkaline system can obtain very good ductility and toughness of the molten metal, but the workability is far worse than that of an acidic system. The transition of molten droplets is mainly based on the transition of spherical droplets, and there are more splashes. The development of the flux system for low-alloy steel welding consumables combines the workability of the acidic system and the excellent mechanical properties of the alkaline system.