A crack-proof tube plate surfacing welding method

Abstract

The invention relates to the technical field of welding, in particular to a cracking-prevention tube plate surfacing method. The surfacing method comprises the steps of treatment before welding and a welding process, wherein the treatment before welding comprises the steps that a tube plate is integrally preheated until the tube plate is thoroughly heated, flanges are arranged on the periphery of the surfacing face of the tube plate, and an R area is formed in the joints of the flanges and the surfacing surface; the welding process comprises the R area welding process and the welding process for the area besides the R area in sequence. According to the cracking-prevention tube plate surfacing method, the R area is welded first, preheating of the tube plate is fully utilized, the problem that cracking is likely to occur in surfacing of the R area of the tube plate is thoroughly solved, and the product quality is improved; in the process of welding the area besides the R area later, the requirement for the temperature only exists before a first layer un-welding area is welded, the tube plate does not need to continue to be heated for the rest of welding layers after the first layer, the preheating heat of the tube plate and the welding heat of each welding seam are utilized in the preheating heat of the first layer to preheat a next welding seam before welding, and thus the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a surfacing welding method for a tube sheet with an R zone. Background technique [0002] In boiler auxiliary equipment and various petrochemical heat exchanger products, there is tube plate surfacing welding. Since the tube plate surfacing layer needs to be welded with the heat exchange tube, the quality requirements of the surfacing layer are high, and the surfacing thickness is relatively thick. Generally not less than 6mm. For tube plate surfacing welding, at present, strip surfacing welding is mainly used, and multi-layer surfacing welding is adopted during surfacing welding. Weld the next layer. Due to the large thickness of the tube sheet, and the material is Mn-Mo steel or alloy steel, which has a high tendency to cold cracks, it needs to be preheated at a higher temperature before surfacing welding, because the thickness and volume of the tube sheet are large, during ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the current tube-sheet surfacing method not only has high energy consumption and long production cycle, but also prone to cold cracks in the tube-sheet R zone, the technical problem to be solved by the present invention is to provide a tube-sheet surfacing method for preventing cracks, through Improve the process, fundamentally solve the problem of cracks in the R zone of the tube sheet, and at the same time effectively reduce the warm-up time, thereby reducing energy consumption in the manufacturing process and shortening the product production cycle

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