Abstract
The susceptibility to hot cracking depends on the alloy composition, the welding parameters and the clamping conditions. We combined the simplicity of the fan shaped cracking test introduced by Kutsuna with the digital image correlation method to evaluate the local strain rate at the solidification zone. The analysis gives quantitative information, which strain rate is needed to stop the centerline crack propagation. By this approach, the hot cracking susceptibility was quantified by measuring the critical strain rate for four different AlMgSi aluminum alloys at three different weld speeds.
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