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焊缝中细小的等轴晶组织,有较高的抗热裂纹能力。因此,研究细化晶粒的方法就成为目前焊接领域中的一项重要课题。一般钨极氩弧焊焊缝的晶粒组织与焊接条件和合金成分有关。近来的研究指出,铝合金氩弧焊焊缝中细晶组织的形成主要是钛和(或)锆异质成核的结果。这与众所周知的钛和锆细化铝合金铸锭晶粒的观点是一致的。 Matsuda等人研究了外加交变磁场对焊缝晶粒组织的影响。在一定的条件下,外加交变磁场的作用因合金而异,有的影响很
Weld small equiaxed grain structure, a higher resistance to thermal cracking. Therefore, the study of grain refinement has become an important issue in the field of welding. General TIG weld grain structure and welding conditions and alloy composition. Recent research indicates that the formation of fine-grained microstructure in the TIG weld is mainly the result of heterogeneous nucleation of titanium and / or zirconium. This is in agreement with the well-known crystal grain of titanium and zirconium-refined aluminum alloy ingots. Matsuda et al. Studied the effect of the applied alternating magnetic field on the grain structure of the weld. Under certain conditions, the role of the applied alternating magnetic field due to the alloy, and some very influential