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Welding method and procedure for clad plates
Jul 31, 2018

1. Welding method

Manual arc welding, submerged arc welding, and carbon dioxide gas shielded welding are recommended for the welding of the base layer. The welding of the clad layer and the over-layer is performed by tungsten argon arc welding and manual arc welding, and other welding methods which can ensure the welding quality can also be used.

 

2. Welding procedure

Welding should first weld the base layer, then weld the transition layer, and finally weld the layer. When conditions are limited, it is also possible to weld the clad layer first and then weld the transition layer and the base layer. In this case, if the thickness of the composite plate is less than 10 mm, the welding of the base layer can directly use the same welding material as the transition layer. If the thickness of the composite plate is greater than 10 mm, then The welding thickness of the transition layer can be appropriately increased (the welding thickness of the transition layer should be greater than or equal to 5 mm), and finally the carbon steel or low alloy welded base layer.

 

3. Base layer welding

The weld base weld bead shall not touch and melt the composite material. When welding the substrate first, the root or surface of the weld bead shall be 1-2 mm away from the composite interface. The weld height should be in accordance with the relevant standards. Depending on the thickness of the substrate, the type of steel, and the structure, appropriate pre-heat treatment may be employed as necessary.

 

4. Welding of the transition layer

When welding the transition layer, it is necessary to reduce the amount of fusion of the base metal and reduce the fusion ratio while ensuring good fusion. For this purpose, a smaller diameter electrode or wire and a smaller weld line energy should be used. The thickness of the transition layer should be no less than 2 mm.

 

5. Clad layer welding

When welding the clad layer, it is necessary to protect the surface of the clad layer to prevent the welding spatter from damaging the surface of the clad layer. It is not allowed to randomly arc, weld the forging, the lifting ring and the temporary bracket on the surface of the clad layer. The surface of the lap seam shall be as smooth and smooth as possible with the surface of the stratified layer. The butt weld height is not more than 1.5mm.