保护气体对不锈钢光纤激光焊接的影响
Influence of Shielding Gas on Fiber Laser Welding of Stainless Steel
李耿1，张林2，高明1，张臣1，严军1，曾晓雁1,*
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作者单位：1.华中科技大学光电子科学与工程学院，武汉光电国家实验室
2.安琪酵母股份有限公司
中文关键字：光纤激光焊接；不锈钢；保护气；焊接熔深
英文关键字：fiber laser welding; stainless steel; shielding gas; bead penetration depth
中文摘要：实验研究了保护气参数，如气体类型、流量、混合比例、吹气角度、落点位置等对不锈钢光纤激光焊接熔深的影响。结果表明，气体类型对焊接熔深有显著影响，且熔深按照He＞N2＞Ar的顺序排列；增大气体流量、减小吹气角度、或者增加Ar/He混合气体中He的比例，都会增加熔深；当气体落点位置距激光束光斑中心±1.5mm左右时，焊接熔深最大；而在激光束光斑中心时最小，二者比较熔深的增加值约为50％。
英文摘要：The influence of shielding gas parameters, such as gas type, flow rate, mixing ratio, shielding angle and landing position on fiber laser welding of stainless steel was researched in this experiment. It was found that the bead penetration depth depends on the type of shielding gas, and it was increased gradually by using the shielding gas in the sequence of Ar, N2 and He. It was also found that by rising the flow rate, reducing the shielding angle, or increasing the volume ratio of He in Ar/He mixing gas, the bead penetration would increace. As the gas landing position is ±1.5mm away from the laser spot, the bead penetration depth is maximum; but when it is at the laser spot, the bead penetration is minimum. It raises about 50％ compared with the maximum and minimum penetration depth.