Do you understand the relevant knowledge of flux-cored arc welding?
Release time:
2022-08-10
【Summary Description】 Flux-cored wire first appeared in the United States and Germany in the 1920 s, but it was actually widely used in industrial production in the 1950 s. Especially after the 1960 s and 1970 s, with the emergence of all-position flux-cored wire with a fine diameter below Φ2.0, the flux-cored wire has entered a stage of rapid development, followed by the development of metal powder-cored wire and seamless flux-cored wire. Flux-cored wire can be divided into seamed and seamless flux-cored wire according to the manufacturing process and cross-section type. Seamless flux-cored wire has good anti-moisture absorption ability and can be convenient for long-term storage, but due to its complex manufacturing process, the general price is higher. core in the role of welding: 1. Deoxidation to prevent weld metal oxidation; 2. Provide alloying elements to ensure weld performance; 3. Stabilize the arc and ensure good operability; 4. Protect the molten pool and facilitate weld formation. the working principle of FCAW-G: The basic working principle of the FCAW-G is the same as that of the ordinary gas shielded arc welding. It uses the meltable flux-cored wire as the positive electrode and the base material as the negative electrode. Pure CO2 or CO2 + Ar mixture is usually used as the protective gas. The main difference with ordinary MIG welding is that the welding wire is filled with flux mixture. During welding, the flux material, welding wire metal, base metal metal and shielding gas in the molten state under the action of arc heat have metallurgical interaction with each other, and at the same time, a thin layer of liquid slag is formed to cover the molten droplets and cover the molten pool, forming protection for the molten metal, which is essentially a welding method of gas-slag joint protection. Advantages and disadvantages of FCAW-G in welding production: Advantages: 1. High deposition rate and production efficiency; 2. Suitable for all position and outdoor welding; 3. Good manufacturability, beautiful welding forming; 4. Suitable for semi-automatic and mechanical welding. Disadvantages: 1. The welding wire manufacturing process is complicated; 2. Seamed flux-cored wire is easy to absorb moisture; 3. Welding fume is large. In view of the above characteristics, FCAW-G has been widely used in structural welding in the marine industry, accounting for about 70%. For process pipeline and pressure vessel welding, due to the high quality requirements of welding materials, some projects have the requirement of prohibiting the use of flux-cored wire, but with the continuous improvement of the quality of flux-cored wire, the FCAW-G is gradually being accepted, its application scope is wider and wider, and the degree of welding automation is also gradually improving.
Flux-cored wire first appeared in the United States and Germany in the 1920 s, but it was actually widely used in industrial production in the 1950 s. Especially after the 1960 s and 1970 s, with the emergence of all-position flux-cored wire with a fine diameter below Φ2.0, the flux-cored wire has entered a stage of rapid development, followed by the development of metal powder-cored wire and seamless flux-cored wire. Flux-cored wire can be divided into seamed and seamless flux-cored wire according to the manufacturing process and cross-section type. Seamless flux-cored wire has good anti-moisture absorption ability and can be convenient for long-term storage, but due to its complex manufacturing process, the general price is higher.
core in the role of welding:
1. Deoxidation to prevent weld metal oxidation;
2. Provide alloying elements to ensure weld performance;
3. Stabilize the arc and ensure good operability;
4. Protect the molten pool and facilitate weld formation.
the working principle of FCAW-G:
The basic working principle of the FCAW-G is the same as that of ordinary gas shielded welding. It uses a meltable flux-cored wire as the positive electrode and the base material as the negative electrode. Pure CO is usually used.2or CO2Ar gas mixture was used as protective gas. The main difference with ordinary MIG welding is that the welding wire is filled with flux mixture. During welding, the flux material, welding wire metal, base metal metal and shielding gas in the molten state under the action of arc heat have metallurgical interaction with each other, and at the same time, a thin layer of liquid slag is formed to cover the molten droplets and cover the molten pool, forming protection for the molten metal, which is essentially a welding method of gas-slag joint protection.
Advantages and disadvantages of FCAW-G in welding production:
Advantages:
1. High deposition rate and production efficiency;
2. Suitable for all position and outdoor welding;
3. Good manufacturability, beautiful welding forming;
4. Suitable for semi-automatic and mechanical welding.
Disadvantages：
1. The welding wire manufacturing process is complicated;
2. Seamed flux-cored wire is easy to absorb moisture;
3. Welding fume is large.
In view of the above characteristics, FCAW-G has been widely used in structural welding in the marine industry, accounting for about 70%. For process pipeline and pressure vessel welding, due to the high quality requirements of welding materials, some projects have the requirement of prohibiting the use of flux-cored wire, but with the continuous improvement of the quality of flux-cored wire, the FCAW-G is gradually being accepted, its application scope is wider and wider, and the degree of welding automation is also gradually improving.
Related News
Telephone:+86-18594983359
E-mail:Firmkim@cn-huaguang.com
Zip Code: 311112
Address: No. 82, Qihang Road, Renhe Street, Yuhang District, Hangzhou City, Zhejiang Province
Douyin QR code
We chat number
WeChat public account