毕业设计--不锈钢与铜焊接工艺及金相分析

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1、I 摘摘 要要 本论文主要研究铜与不锈钢的焊接工艺，即异种材料的焊接工艺研究， 为异 种材料铜和不锈钢的焊接提供理论基础和试验基础。 主要采用的焊接方法为钨极 氩弧焊(TIG)焊。 不锈钢及铜中含有合金元素(Ni，Si，V)和杂质(O，S，P)，在焊接过程中易 形成各种低熔点共晶体和脆性化合物，严重削弱了金属在高温时的晶间结合力。 由于铜导热系数比不锈钢大得多，需采用大功率热源，因此热影响区宽，使接头 承受较大应力，焊缝易产生热裂纹。近缝区不锈钢一侧易产生渗透裂纹，其原因 是由液态铜对钢有渗透作用和拉应力造成的。 通过焊接检验可知，焊缝具有良好的性能；经金相检验，焊缝内部组 织均匀；紫铜和紫铜

2、熔合区过渡均匀，结合良好；紫铜与碳钢熔合线平直， 无孔洞，且 Cu 和 Fe 相互之间有一定程度扩散，熔合区为冶金结合。 关键词：关键词： 紫铜； 不锈钢； 焊接工艺； 金相分析 II Abstract This paper studies in copper and stainless steel welding technology, Namely dissimilar material of welding technology research for the dissimilar materials copper and stainless steel welding to prov

3、ide the theoretical foundation and experimental basis. The mainly welding processec is tungsten inert gas arc welding (TIG)welding. Stainless steel and copper alloy containing elements (Ni, Si, V) and impurities (O, S, P), in the welding process in the formation of low-melting-eutectic and brittle c

4、ompounds, severely weakening the metal in the temperature of crystallization binding force. thermal conductivity of copper due to greater than stainless steel, to use high-power heat, the heat-affected zone width, the larger joints under stress, thermal weld cracks easily. seam zone near the side of easy to produce stainless steel Crack infiltration, which is caused by the liquid steel with copper on infiltration and the tensile stress. Through welding inspection, we can see that Weld has a good