Carbon dioxide gas shielded welding method for austenitic stainless steel pressure vessel

Abstract

The invention provides a carbon dioxide gas shielded welding method for an austenitic stainless steel pressure container. The carbon dioxide gas shielded welding method comprises the following steps that end faces, to be welded, of base metal are polished to form 30-degree oblique faces, the two pieces of base metal to be welded are assembled to form a V-shaped groove, the gap between the two pieces of base metal ranges from 1 mm to 2 mm, the unfitness of a butt joint is 1 mm or smaller, and then priming coat welding, packing layer welding, back face packing layer welding, back face and cover face layer welding and cover face layer welding are sequentially carried out on a weld seam according to welding process parameters of different welding layers. According to the characters of the austenitic stainless steel pressure container, the reasonable welding sequence and the welding process parameters are determined, the welding heat affected zone is relatively narrow, welding stress and deformation of austenitic stainless steel are reduced, the corrosion resistance of a workpiece after the austenitic stainless steel is welded is improved, and the welding quality of the austenitic stainless steel is improved. By means of the welding method, the weld seam is fine in surface line, attractive in shape and weak in splashing, and the appearance quality of the pressure container weld seam is improved.

Description

technical field [0001] The invention relates to the technical field of pressure vessel manufacturing, in particular to a carbon dioxide gas shielded welding method for austenitic stainless steel pressure vessels. Background technique [0002] With the rapid development of engineering welding technology, modern pressure vessels have also developed into a typical all-welded structure. Welding of pressure vessels has become the most important and critical link in the manufacturing process of pressure vessels, and the quality of welding directly affects the quality of pressure vessels. Because pressure vessels are easy to be hardened during welding, these hardened structures are very sensitive. Therefore, in the case of high rigidity or high restraint stress, cold cracks are likely to occur if the welding process is improper. The existing pressure vessel welding adopts electrode arc welding. , The welding seam is not beautiful and the manufacturing cost is high, the efficiency ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a carbon dioxide gas shielded welding method for austenitic stainless steel pressure vessels. The welding method is to weld the weld seam in layers and adopt different welding process parameters for each layer, and add rapid cooling during the welding process. The process makes the welded seam have strong pressure resistance and high welding efficiency, which solves the technical problems of low welding efficiency and unreliable welding quality in the prior art when manual arc welding is used for austenitic stainless steel pressure vessels

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