Common Welding Methods for Steel Structures

Using the heat generated by the electric arc discharge to melt the welding rod and weldment with local heating to form a weld.Using the heat generated by the electric arc discharge to melt the welding rod and weldment with local heating to form a weld.

Manual electric arc welding: Using the heat generated by the electric arc discharge to melt the welding rod and weldment with local heating to form a weld. This method has simple equipment, flexible operation and is suitable for welding in various positions, but the productivity is low, the labour intensity is high, and the welding quality is greatly affected by the technical level of the welder.

Automatic (or semi-automatic) submerged arc welding: The wire and the weldment are connected to the two poles of the welding power source, the wire through the arc discharge with the weldment between the heat generated by the wire and the weldment will be locally heated and melted, the formation of weld seam. The method of high welding efficiency, good seam quality, low labour intensity, but only for long weld welding.

Gas shielded welding: The use of carbon dioxide gas or other inert gases as a protective medium to prevent the intrusion of harmful gases, to ensure the stability of the welding process. The method of high seam strength, plasticity and corrosion resistance, suitable for all-position welding, but not for welding in windy places.

Resistance Welding: The heat generated by the resistance of the surface of the contact point of the weldment through the use of electric current is used to melt the metal, which is then welded together by applying pressure. This method is only applicable to the welding of plate stacks with a thickness of not more than 12mm.