Based on infrared thermograph technique, the characteristics of 5A90 temperature field are studied in laser welding with different shielding gases, and some relevant conclusions are obtained:At different welding speeds, the shielding gas has great influence on the temperature field characteristics and the evolution law of 5A90 in laser welding, and the influence law is slightly different.In general, when helium(He) is used as the shielding gas, the keyhole and the molten pool are more stable, and the keyhole center and back temperature is lower. At different laser power, the temperature field distribution on face of weld is almost not affected when He is used as the shielding gas. However, it has a significant difference when argon(Ar) is used as the shielding gas. For example, the mean temperature of the characteristics of the keyhole center increases by 158℃. In addition, the molten pool length exists large difference between helium and argon as the shielding gas. The results show that the effect of these two gases is different in the absorption of laser energy and the flow of molten pool. Moreover, it is also indicated that the thermal process of the welding joint is slightly different, even if the heat input is same under different laser power and welding speed.
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