各種実用Al合金溶接時の固液共存温度域における延性特性と溶接凝固割れ感受性の評価

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The ductility characteristic of solidifying weld metal between liquidus and solidus temperatures during welding has been measured by externally-restraint solidification cracking tests, namely Trans-Varestraint test and Slow Bending type Trans-Varestraint test. Minimum augmented strain to cause cracking (εmin), Brittleness temperature range (BTR) and Critical strain rate for temperature drop (CST) were selected from ductility characteristics as criteria to evaluate weld solidification crack susceptibility. In addition, solidification crack susceptibility of 16 kinds of commercial aluminum alloys from 1000 to 7000 series has been evaluated qualitatively by self-restraint type solidification cracking tests, namely Ring-casting test, GTAW crater cracking test, Houldcroft type test and Fan-shaped test. Moreover, as a metallurgical factor, gain size of weld metal and dihedral angle of eutectic products in grain boundary and the amount of eutctic products were also measured. Correlation between the test results obtained by self-restraint tests, criteria showing ductility characteristics and metallurgical factors were discussed. CST is the most suitable criterion to evaluate weld solidification crack susceptibility of Al alloys, because crack susceptibility was monotonically decreased as the increase of CST. ε_<min> and BTR are also important criteria to show the threshold at which crack susceptibility begin to increase steeply. At more than about 0.22% in ε_<min> or less than 43℃ in BTR, Al alloy showed very low susceptibility to cracking. Among metallurgical factors, dihedral angle and grain size showed close relation to crack susceptibility, but the amount of eutectic products didn't.
1995-02-05

各種実用Al合金溶接時の固液共存温度域における延性特性と溶接凝固割れ感受性の評価

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