A kind of sa-213 S30432 material membrane tube screen welding method

Abstract

A welding method for SA‑213S30432 material membrane tube panel, relating to a welding method to solve the problem that SA‑213S30432 membrane tube panel welding tends to have thermal cracks, the restraint stress is large, the risk of welding cracks is increased, and the thermal conductivity of stainless steel is poor Moreover, the coefficient of thermal expansion is large, and welding is extremely prone to deformation problems. The present invention comprises the following steps: S1, after a plurality of pipes and flat steels made of SA-213S30432 are placed horizontally according to the layout of the tube panel, a plurality of pulse melting electrode gas shielded welding power sources are equipped; S2, a plurality of welding torches are arranged, each The welding torch is connected to the pulse melting pole gas shielded welding power supply, and the welding torches are arranged on the upper and lower sides of the pipe and the flat steel, and each welding torch points to the joint between the pipe and the flat steel; Uniform welding. The welding seam of the invention is uniform and full in shape, smoothly transitions with the base material, has no defects, adopts upper and lower welding torches to perform welding simultaneously, and has small deformation after welding.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method of a boiler membrane tube panel. Background technique [0002] SA-213 S30432 is a stainless steel alloy with excellent high temperature strength, plasticity and corrosion resistance obtained by adding appropriate amount of Cu, Nb, N and other elements on the basis of SA-213 TP304H, and is widely used in high-parameter boiler superheaters. , reheater and other high temperature heating surfaces. At present, the high temperature heating surface of this material is mostly serpentine tube layout, and the membrane tube screen structure has not been applied. [0003] SA-213 S30432 stainless steel contains high Cr, Ni and other alloy components, and the tendency of welding hot cracks is large, and the film tube screen welds are dense, and the restraint stress is large, which increases the risk of welding cracks, and the thermal conductivity of stainless steel is poor and thermal expa...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that SA-213 S30432 membrane type tube panel has a large tendency of welding thermal cracks and restraint stress, which increases the risk of welding cracks, stainless steel has poor thermal conductivity and a large thermal expansion coefficient, and welding is very easy to produce deformation. Problems, and provide a A Welding Method of SA-213 S30432 Material Membrane Tube Screen

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