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Start Over Author "Luo, Tianyuan" Publisher elsevier bv
17 results on '"Luo, Tianyuan"'

15. Effect of beam offset on the characteristics of copper/304stainless steel electron beam welding

Author

Yong Peng, Jian Kong, Qi Zhou, Yan Xiang, Zhu Jun, Luo Tianyuan, Kehong Wang, and Guo Shun

Subjects
010302 applied physics, Heat-affected zone, Materials science, Metallurgy, Laser beam welding, 02 engineering and technology, Welding, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Surfaces, Coatings and Films, law.invention, Fusion welding, law, 0103 physical sciences, Ultimate tensile strength, Electron beam welding, 0210 nano-technology, Instrumentation, Joint (geology), Beam (structure)
Abstract

Copper (T2) and 304stainless steel were joined by EBW with different beam offset. Full-strength joint as well as the offset joints of sufficient strength can be obtained. The highest tensile strength reaches 250Mpa, which is almost equal to the strength of copper. By analyzing phase structure and distribution of weld zone, bonding interface of fusion zone, width and grain size of heat affected zone, diffusion behavior of Fe/Cr, cooling rate and fracture behavior, the effect of beam offset on the joint strength was detailed studied. The results show that beam offset is flexible and allowed to be in the range of −0.2 mm to 1 mm. Under the condition of small beam offset, the performance of the joint is nice because of narrow HAZ and weld zone of few defects. But for large offset which leads to low joint performance on copper side or steel side, the main reasons respectively are deterioration of HAZ, FZ and low metallurgical bonding of root interface. Toughness fracture was proved by dimples for fusion welding, but brittle fracture occurred for re-melt deposit welding of large offset.

Published
2016
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