Copper-steel dissimilar metal welding method

Abstract

The invention discloses a copper-steel dissimilar metal welding method. A copper part and a steel part are welded together to form a copper-steel corner welding workpiece. The copper-steel dissimilar metal welding method comprises the following steps: firstly, a surfacing copper based alloy welding material is heated on one side of the copper part so as to form a copper based alloy transition layer on the welding surface of the copper part, secondly, assembling the steel part on the copper part to perform spot welding after cooling the copper part and trimming weld joints, and finally adopting a copper based welding rod to weld the copper based alloy transition layer and the steel part together, wherein the welding method is gas shield welding in a cold state. The copper-steel dissimilar metal welding method adopts a surfacing copper based alloy transition layer in a hot state so as to enable the copper based alloy welding material to be combined with the copper part well, then the copper-steel corner welding is performed in the cold state which is convenient to operate, and penetration ratio of weld metal can be controlled effectively, thereby preventing weld joint hot crack from being produced and meeting the welding requirements.

Description

technical field [0001] The invention relates to a welding process, in particular to a copper-steel dissimilar metal welding method. Background technique [0002] At present, the fillet welding structure of copper-steel dissimilar metals generally adopts cold welding and hot welding. Large thermal stress, so cracks will occur; liquid copper often penetrates into the steel grains in the fusion zone on the steel side, resulting in the formation of thermal cracks, especially in products with large workpieces and small welding spaces. Quality is difficult to guarantee. How to provide a copper-steel dissimilar metal welding method that is easy to operate and meets welding requirements has become an urgent need for people. Contents of the invention [0003] The purpose of the present invention is to overcome the limitation of the prior art that the conventional welding method is difficult to meet the welding requirements due to the limitation of the welding seam structure of th...

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Problems solved by technology

[0002] At present, the fillet welding structure of copper-steel dissimilar metals generally adopts cold welding and hot welding. Large thermal stress, so cracks will occur; liquid copper often penetrates into the steel grains in the fusion zone on the steel side, resulting in the formation of thermal cracks, especially in products with large workpieces and small welding spaces. Difficult to guarantee quality

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