高端刀具异种钢A-TIG焊焊接性

针对高端刀具焊接时必须整体预热,接头质量不稳定的问题,采用A-TIG焊接方法对高端刀具中的430不锈钢刀背和3Cr13-1Cr17-3Cr13"三明治"复合不锈钢刀刃进行焊接.研究了活性剂对焊缝熔深﹑焊缝气孔﹑接头力学性能﹑微观组织及接头抗腐蚀性能的影响,并和常规TIG焊进行了比较.结果表明,利用A-TIG可以无需预热实现430不锈钢刀背和3Cr13-1Cr17-3Cr13"三明治"不锈钢刀刃的焊接,且单面焊双面成形,焊缝中未出现气孔、裂纹,接头抗拉强度可达606 MPa;接头热影响区非常窄,焊缝晶粒得到细化;活性剂的加入未降低焊接接头的抗腐蚀性能.因此,高端刀具异种钢A-TIG焊具有良好的焊接性,接头质量高.

Weldability of dissimilar steels for high-end cutting toolswith A-TIG welding

In TIG welding of high-end cutting tools, the entire tools must be preheated. A-TIG welding was selected in this paper to weld 430 stainless steel knife back and sandwich(3Cr13-1Cr17-3Cr13) stainless steel blade, and study the effect of fluxes on the weld shape. The differences between A-TIG and conventional TIG on the weld penetration, pores in the weld, microstructure, mechanical properties and corrosion resistance of the joint were studied in this paper. The results show that satisfied joint with excellent weld appearance between 430 stainless steel knife back and sandwich(3Cr13-1Cr17-3Cr13) stainless steel blade could be achieved by A-TIG welding. No defects were detected in the joint and the grains in weld were refined. The HAZ was very narrow and the tensile strength of joint was 606 MPa. The activating flux did not reduce the corrosion resistance of welded joint.