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管道焊接中的单面焊双面成形工艺早已在国内获得广泛应用。但在狭窄位置、固定管口的焊接时,仍会遇到不少困难,主要是在加填充丝手工钨极氩弧焊封底焊接时,加丝困难和看不清熔池,焊接质量很难得到保证。为此,我们根据现有条件,从工艺上进行了改革,摸索出了一种比较简单、并容易获得稳定的焊接质量的加填塞环手工钨极氩弧焊新工艺,并进行了模拟试验,效果良好。一名中级焊工只需熟悉一天即能熟练掌握,并焊出质量满意的焊缝。一、焊接材料和性能试验所采用的材料,选用高桥化工厂裂解试验炉的材料,其化学成份和规格及机械性能如下: 填充材料的确定:裂解炉用Cr25Ni20奥氏体钢焊接,一般资料认为焊缝中碳的增加,对抗裂倾向有利,可使焊缝形成奥氏体十碳化物的双相组织,在一定程度上可提高抗热裂性能、含碳量为0.15～
Pipe welding in the single-sided welding double-sided forming process has long been widely used in the country. However, in the narrow position, the welding of the fixed nozzle will still encounter many difficulties, mainly due to difficulty in adding wire and inability to see the molten pool when welding with filler wire by manual TIG welding, it is very difficult to weld Guaranteed. For this reason, according to the existing conditions, we have carried out the reform from the craft and found out a new process of filling tungsten-arc TIG welding with a relatively simple and easy-to-obtain stable welding quality. The simulation tests were carried out, Good effect. A mid-level welder just familiar with a day that is proficient, and welding out the quality of the weld. First, welding materials and performance testing materials used, the selection of materials Takahashi plant crack test furnace, the chemical composition and specifications and mechanical properties are as follows: Filling material to determine: cracking furnace Cr25Ni20 austenitic steel welding, general information It is considered that the increase of carbon in the weld and the favorable tendency of crack resistance can make the weld form dual phase structure of austenite ten-carbide and improve the hot-cracking resistance to a certain extent, with the carbon content of 0.15 ~