Experimental study of dual-beam laser welding of AISI 4140 steel
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Mechanical Engineering and Applied Mechanics
Experiments were conducted to assess the impact of dual-beam laser welding on the cooling rates, and thus microstructure and hardness, of weldments. Temperature measurements were continuously recorded using K-type thermocouples. The results indicate that dual-beam laser welding reduces the hardness of a weldment when compared to the case of single-beam laser welding. For example, the hardness of the hot-rolled AISI 4140 steel used was about 283 HB before laser welding. After laser welding with a power of 800 W and a welding speed of 10 mm/s, the hardness became 552 HB; but with a preheating power of 800 W and an interbeam spacing of 10 mm, the hardness reduced to 477 HB for the same welding speed. The impacts of minor heat source power, welding speed and interbeam spacing on weldment hardness and weld shape for both preheating and postheating cases are discussed.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 532968
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 9 Vol. 76; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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