Cold wire submerged-arc welding method

Abstract

The invention relates to a cold wire submerged arc welding that aims to reduce the partial softening phenomenon caused by reducing big wire energy for the base metal and welding seam, making the best of the electric arc heat, improving fuse efficiency, acquiring better welding seam forming and quality, using burning arc welding wire and welded piece generated arc to be the heat source, featuring in using a piece of nonconductive and nonheated cold wire inserted into the overheated fuse pool as the stuffing metal, the stuffing position in the direction of the welding in the center of the arc center of the high temperature fuse pool, suddenly stopping feeding cold wire then extinguishing the burning arc welding wire, finishing the welding before the completion of the welding.

Description

technical field [0001] The invention relates to submerged arc automatic welding in arc welding, and the international patent classification is B23K9 / 18. Background technique [0002] Submerged arc automatic welding is a kind of high-energy fusion that uses molten flux to participate in the metallurgical reaction of the weld while forming an air cavity under the flux layer to isolate the air. Welding method. However, when this process method is used for welding pipeline steel, high-strength steel and other heat-sensitive medium and thick plates, the overheating caused by the large input energy to the base metal will cause damage such as softening of the heat-affected zone. [0003] The multi-wire multi-arc submerged arc welding method currently used in the industry has been used in welding some thick plate welding structures (large ship hulls, welded steel pipes, thick-walled pressure vessels, H-shaped steel beams), and as many as 3 to 6 sending machines have been used. The...

AI Technical Summary

Problems solved by technology

It is often necessary to correct the deformation problem caused by high heat input after welding, and ignore the thermal damage to the base metal

Especially when using single-wire or multi-wire submerged arc welding of fine-grained high-strength steel and a class of materials with strong heat sensitivity, large energy input into the base metal and weld will cause overheating damage to the base metal and weld, It causes the grain coarsening in the heat-affected zone of the base metal, resulting in local softening, which makes the mechanical properties of the heat-affected zone uneven, affecting the welding quality and performance

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