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논문 기본 정보

자료유형
학술저널
저자정보
Xiqing Li (Beijing Jiaotong University) Wei Liu (Beijing Jiaotong University) Yutong Chen (Beijing Jiaotong University) Zhiguo Zhang (Beijing Jiaotong University) Peiwei Bao (Beijing Jiaotong University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.9
발행연도
2024.9
수록면
2,571 - 2,580 (10page)
DOI
10.1007/s12540-024-01667-z

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The aim of this study is to prevent thermal cracking in the fusion zone of dissimilar resistance spot weld, which arises dueto the electrical and thermal conductivity differences of austenitic steel and weathering steel. Therefore, dissimilar doublepulse resistance spot welding experiments were carried out on 4-mm-thick 301LN austenitic stainless steel and 09CuPCrNiweathering steel sheets. The first low-current pulse was used for prewelding, and the second high-current pulse was usedfor weld generation under a high electrode force. Under these conditions, satisfactory welds that met the welding criterionwithout thermal cracks or central shrinkage cavities were obtained. In the fusion zone of the double pulse weld, the phasespresent were lath martensite, δ-ferrite, austenite and phosphorus-rich eutectic. There was a small amount of austenite in thiszone, and the eutectic appeared at the grain boundaries. The failure mode of the double pulse weld was pull-out fracture. Finally, the load-bearing capacity of the double pulse weld was 35% greater than that of the single pulse weld.

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