Welding type bai method:
1. Electrode arc welding:
Principle du-electric dao arc welding method using manual welding electrode zhi. The stable burning arc established between the welding rod and the weldment is used to melt the welding rod and the weldment to obtain a firm welded joint. It belongs to gas-slag joint protection.
Main features-flexible operation; low assembly requirements to be welded; wide range of weldable metal materials; low welding productivity; strong dependence on weld quality (depending on the welder's operating skills and on-site performance).
Application-widely used in shipbuilding, boilers and pressure vessels, machinery manufacturing, building structures, chemical equipment and other manufacturing and maintenance industries. Suitable for welding of various metal materials, various thicknesses, and various structural shapes (in the above-mentioned industries).
2. Submerged arc welding (automatic welding):
Principle-The arc burns under the flux layer. The heat generated by the arc burning between the welding wire and the weldment is used to melt the welding wire, flux, and base material (weldwork) to form a weld. It is slag protection.
Main features-high welding productivity; good weld quality; low welding cost; good labor conditions; difficult to weld in space; high quality requirements for weldment assembly; not suitable for welding thin plates (when welding current is less than 100A, arc stability Bad) and short welds.
Application-widely used in shipbuilding, boilers, bridges, hoisting machinery and metallurgical machinery manufacturing. Submerged arc welding can be used for all weldments whose welds can be kept in a horizontal position or whose inclination angle is not large. The board thickness must be greater than 5 mm (to prevent burn through). Welding carbon structural steel, low alloy structural steel, stainless steel, heat-resistant steel, composite steel, etc.
3. Carbon dioxide gas shielded welding (automatic or semi-automatic welding):
Principle: A molten electrode arc welding method using carbon dioxide as a shielding gas. It is gas protection. Main features-high welding productivity; low welding cost; small welding distortion (arc heating concentration); high welding quality; simple operation; high spatter rate; difficult to weld with AC power; poor wind resistance; not able to weld easily oxidized colored metal.
4. MIG/MAG welding (Melting inert gas/active gas shielded welding):
MIG welding principle-an arc welding method that uses inert gas as a shielding gas and welding wire as a melting electrode. The shielding gas is usually argon or helium or their mixture. MIG uses inert gas, MAG adds a small amount of active gas, such as oxygen, carbon dioxide, etc. to the inert gas.
5. TIG welding (tungsten inert gas shielded welding)
Principle——Under the protection of inert gas, the base metal and filler wire are melted by the arc heat generated between the tungsten electrode and the weldment (or without filler wire) to form a welding seam. The electrode does not melt during welding.
6. Plasma arc welding
Principle——Rely on the restraining effect of the water-cooled nozzle on the arc, the method of obtaining high energy density plasma arc welding.
