1、Electrode arc welding

Principle: Arc welding method using manually operated electrodes. 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 strong welding joint. It belongs to the combined protection of gas and slag

Main feature： Flexible operation and low assembly requirements for the joint to be welded.Wide range of weldable metal materials. Welding productivity is low. Weld quality is highly dependent (depends 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 various metal materials, thicknesses, and structural shapes (in the above sectors).

2、Submerged arc welding (automatic welding):

Principle: The arc burns under the flux layer. The welding seam is formed by melting the welding wire, flux, and base material (welding piece) by using the heat generated by the arc burning between the welding wire and the welding piece. It belongs to slag protection.

Main features: High welding productivity, good weld quality, low welding cost, good working conditions, difficult welding in spatial positions, and high requirements for weldment assembly quality.Not suitable for welding thin plates (when the welding current is less than 100A, the arc stability is not good) 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 that can maintain a horizontal position or have a small inclination angle. The plate thickness needs to 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: Metal arc welding method using carbon dioxide as shielding gas.Attribute of air protection.Main features: high welding productivity; low welding cost; small welding deformation (concentrated arc heating); high welding quality; simple operation; high spatter rate; difficult to weld with AC power.

4、MIG/MAG welding (melted extremely inert gas/active gas shielded welding)： The principle of MIG welding： An arc welding method that uses inert gas as a shielding gas and a welding wire as a melting electrode. The protective gas is usually argon or helium or their mixtures. Inert gas for MIG.MAG adds a small amount of active gas, such as oxygen, carbon dioxide, etc. to the inert gas.

5、TIG welding (tungsten inert gas welding)：

The principle: Under inert gas protection, the base metal and filler wire are melted using the arc heat generated between the tungsten electrode and the weldment (the filler wire may not be added) to be welding methods to form welds.

6、Plasma arc welding

The principle: A method of welding with a plasma arc of high energy density using the confinement effect of the water-cooled nozzle on the arc.