SA-213 S30432 material membrane tube panel welding method

Abstract

The invention relates to a welding method, in particular to an SA-213S30432 material membrane type tube panel welding method. The problems that an SA-213S30432 material membrane type tube panel is large in welding hot crack trend and large in restraint stress, the risk of welding crack generation is increased, stainless steel is poor in heat conductivity and large in thermal expansion coefficient, and deformation is extremely prone to occurring due to welding are solved. The SA-213S30432 material membrane type tube panel welding method comprises the following steps that S1, after a plurality of pipes and flat steel made of SA-213S30432 are horizontally placed according to the pipe panel layout, a plurality of pulse gas metal shield welding power sources are arranged; S2, a plurality of welding guns are arranged, each welding gun is connected with the corresponding pulse gas metal arc welding power source, the welding guns are arranged on the upper side and the lower side of each pipe and the flat steel correspondingly, and the welding guns point to the joints of the pipes and the flat steel; and S3, an ER308LSi solid gas shielded welding wire is adopted for conducting uniform-speed welding on the pipes and the flat steel. Welding seams are formed uniformly and fully, smooth transition with base metal is achieved, defects are avoided, upper and lower welding guns are adopted for simultaneous welding, and deformation after welding is small.

Description

technical field [0001] The invention relates to a welding method, in particular to a boiler membrane tube panel welding method. Background technique [0002] SA-213 S30432 is a stainless steel alloy based on SA-213 TP304H with appropriate amounts of Cu, Nb, N and other elements added to reduce the content of Mn to obtain excellent high-temperature strength, plasticity and corrosion resistance. It 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 in the form of serpentine tube layout, and the membrane tube-panel structure has not been applied yet. [0003] SA-213 S30432 stainless steel contains high Cr, Ni and other alloy components, and the tendency of welding hot cracks is relatively large, and the weld seams of the membrane tube panel are dense, and the restraint stress is large, which increases the risk of welding cracks. Stainless steel ...

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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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