On the fracture mechanics based development of cleavage fracture resistance criteria for the materials of large-size welded structures

Filin, V. Yu.; Ilyin, A. V.

doi:10.1016/j.prostr.2019.07.054

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…The scientific solutions to problems and technical difficulties related to the connection and joining of components such as weld cracks made from such materials have become increasingly important [4,5]. Hot crack is one of the most critical problems in welds and the manufacturing of aluminum alloy parts [6,7]. In severe cases, the cracks are so serious that the structure may crack open at the weld on solidification or break during operation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

Huang

Chen

Konovalov

et al. 2021

Metals

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In this work, a welding solidification crack sensitivity test platform was established to study the effect of wire feeding speed (WFS) on solidification crack sensitivity during cold metal transfer (CMT) welding for AA6061 aluminum alloy. The test results show that as the WFS increased from 4 m/min to 5.5 m/min, the sensitivity of the solidification cracks also increased. With a further increase in the value of the WFS, the crack sensitivity decreased and eventually ceased to exist. A new perspective of the microstructure and crack propagation mechanics model was applied to understand the effect of WFS on solidification cracks. With the use of scanning electron microscopy (SEM) and a high-speed camera, it was found that as the WFS increased from 4 m/min to 5.5 m/min, the microstructure of the grain size changed from bigger to smaller, and the stability of the crystal microstructure was reduced. The crack propagation mechanics model was changed, which promotes crack propagation, increasing by 233%. When the WFS continued to increase beyond 5.5 m/min, the size of the crystal structure changed from small to big, the stability of the crystal microstructure was increased, the crack generation was suppressed, and the cracking rate was significantly reduced.

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