本文通过刚性平板直焊缝及环形焊缝两种焊接裂纹倾向试验方法,着重研究了焊接线能量和不同填充焊丝对K6C、K18铸造镍基高温合金焊接热裂纹的影响,并测试了热裂纹敏感的温度范围,对两种合金焊接裂纹形成原因进行了金相分析,提出了改善焊接热裂纹敏感性的措施.

In this paper,two methods for weld cracking tendency determination, namely,bead-on-plate and weld-circle tests on the restrained plates were used to study the effect of welding heat input and different kinds of filler wires on weld hot cracking in cast Ni-base superalloys K6C and K18.The tempera-ture ranges which are sensitive to hot cracking were also measured.The ca-uses of weld cracking formation in the two alloys was revealed by metallo-graphic analysis.Finally,some effective measures to improve weld hot cra-cking sensitivity were recommended.