Influence of external loads on a characteristic angle between grains and solidus line as an indicator for hot cracking susceptibility during GTA welding

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• 作者：Christian Gollnow ; Axel Griesche ^{axel.griesche@bam.de" class="auth_mail" title="E-mail the corresponding author} ; Jens Weidemann ^{jens.weidemann@bam.de" class="auth_mail" title="E-mail the corresponding author} ; Thomas Kannengiesser ; ^{thomas.kannengiesser@bam.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hot cracking ; External load test ; Component design ; Crack criterion ; Grain growth
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：239
• 期：Complete
• 页码：172-177
• 全文大小：2217 K

文摘

A long list of criteria determining the hot cracking susceptibility already exists. A main influence on solidification cracking can result from the design of the welded construction, i.e. from the influence of external loads. Using the Controlled Tensile Weldability (CTW) test, an external load hot cracking test, the influence of constant pre-load and different extension rates on the solidification cracking behavior of GTA (Gas Tungsten Arc) welds in an austenitic (AISI 309) and a ferritic (AISI 441) steel were investigated. Compared to specimens welded allowing free shrinkage and welded with an applied constant tensile pre-load, the specimens welded during the application of increasing tensile load show solidification cracks. In the weld seams, a characteristic angle α between the predominantly columnar grains and the fusion line can be observed. Specimens showing solidification cracks show a significantly larger angle α compared to the crack-free specimens. Based on these observations, the characteristic angle α is proposed as a new hot cracking criterion.