Stainless steel band electrode electroslag surfacing welding strip and welding flux

Abstract

The invention discloses a stainless steel band electrode electroslag surfacing welding strip and a welding flux. The Mo element is not added into a transition layer welding strip, but the surfacing metal has sufficient Mo; and the welding strip and the welding flux can be matched to be applied to large-scale surfacing on the inner wall or the outer wall of a container and can meet corrosion-resistant and high-temperature-resistant requirements. When the welding strip and the welding flux are matched for surfacing, the dilution rate is ultralow and is 5 to 12 percent and the production efficiency is high; slag is easy to remove, a formed welding bead is attractive and welding defects do not exist; the intergranular corrosion resistance is excellent; and cracks do not exist during surfacingbending.

Description

technical field [0001] The invention relates to metal welding, in particular to a stainless steel strip electroslag surfacing welding strip and flux. Background technique [0002] In recent years, along with the large-scale and large-scale development of the petrochemical industry, the quality requirements for pressure vessels such as hydrogenation equipment, raw flow synthesis towers, and coal liquefaction reactors have become higher and higher. In addition, thick-walled pressure vessels for nuclear power plants and urea In the equipment, the inner wall is required to be surfacing with austenitic stainless steel as the inner lining to achieve the quality requirements of corrosion resistance and high temperature resistance. For large-area surfacing, the efficiency of manual arc welding and wire electrode surfacing is low, and the internal and surface quality of the surfacing layer is poor, and defects are easily generated at the joint between the surfacing layer and the base...

AI Technical Summary

Problems solved by technology

[0012] ① The surface has large ripples and is uneven;

[0013] ②The welding bead and the base metal fusion are not smooth, and defects such as undercut and slag inclusion are easily produced at the overlapping joint during multi-pass welding;

[0014] ③ Welding speed generally can only reach 16cm / min, which cannot achieve higher welding efficiency

[0015] In addition, in the processing and production of welding strips in the market, the content of Cr and Ni in stainless steel strips is limited in order to improve the yield of steel products, so it is difficult to ensure that the surfacing layer metal achieves excellent corrosion resistance and no cracks after bending , these situations have become more and more difficult to meet the development requirements of petrochemical and other industries

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