Overlaying Weld Cracks of Pinch Roller and its Formation Mechanism

Abstract:

Overlaying pinch roller has higher surface hardness. If the overlaying technology is improper, small circumferential cracks may occur on the welded surface and even peel off. From failure analysis, it is indicated that the contents of C, S, and O were higher around the cracking area in the deposited metal. Optical microscopic observation shows that some cracks grew along the direction of columnar crystals and residual austenite. Due to high content of inclusions and austenite in the deposited material and poor plasticity of the deposited metal, small cracks are easy to be found at the defect such as blue flecks. In addition, a large number of cracks intersect on the deposite surface, resulting in large peeled area.

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 1965-1971
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.1965
• Online since: May 2012
• Authors: Qing Bao Wang, Zhuo Xin Li, Yao Wu Shi, Guo Dong Li, Hui Wang
• Keywords: Crack, Overlaying, Pinch Roller, Residual Austenite

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