MAG welding process for austenitic stainless steel pipeline

Abstract

The invention discloses an MAG welding process for an austenitic stainless steel pipeline. The MAG welding process comprises the following steps of pre-welding preparation: selecting a moderate-thickness plate and above 108mm austenitic stainless steel as a base material, selecting a pipe, a liner and a stainless steel welding wire, cutting a groove in the base material through processing, and carrying out welding; protective coating applying: blending acetone for coating powder to form a paste before welding, and uniformly applying a coating within 10mm range of the inner part of the pipe groove; test piece assembly: attaching the liner to the pipe groove, and positioning and point-fixing the liner and the groove; and welding: putting welding equipment at the horizontal position directlyabove the pipe, clamping the pipe by a rotating device, welding the pipe in two semicircles, and welding a bottoming layer, a filled layer and a cover layer in sequence. The MAG welding process adoptsfull-automatic and semi-automatic MAG welding, a stainless steel isosceles trapezoid liner plate is applied to the front side of the groove, and the stainless steel back side adopts the protective coating, so argon filling on the back side is eliminated, the welding efficiency and quality are improved, and the welding cost is reduced.

Description

technical field [0001] The invention relates to the technical field of welding of austenitic stainless steel pipes, in particular to a MAG welding process for austenitic stainless steel pipes. Background technique [0002] Due to its anti-corrosion and anti-rust properties, stainless steel is widely used in many industrial products, especially in special industries such as chemical tankers and pressure vessel pipelines in the shipping industry, where the demand is large and the quality requirements are high. Welding, also known as welding or welding, is a manufacturing process and technology for joining metals or other thermoplastic materials such as plastics by means of heat, high temperature or high pressure. Welding achieves the purpose of joining through the following three ways: Heating the workpieces to be joined to make them partially melt to form a molten pool, and then join after the molten pool cools and solidifies. If necessary, fillers can be added to assist. ...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional welding process used when welding stainless steel pipes mainly uses argon gas filling in the pipe, argon arc welding as a primer, manual arc welding or inert or mixed gas filling the cover surface, and the cost of argon filling High and time-consuming, while argon arc welding has high welding cost and low efficiency

The traditional welding of stainless steel pipes requires the combined use of two welding methods, which increases the investment in equipment and limits the conditions on the production site; moreover, the process of traditional welding stainless steel pipes is basically manual operation, which is slow in efficiency and depends on welding quality. Welder's Operational Skills

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