【摘要】 本文以激光-MIG复合焊焊接工艺参数对焊缝形状的影响为出发点,对复合焊进行了初步的研究。实验研究了激光与电弧之间的距离、离焦量、焊接速度、送丝速度、电弧的类型以及激光的倾斜角度等工艺参数对复合焊焊缝的熔深熔宽的影响。实验表明,激光与电弧之间的距离(DL A)对复合焊的熔深影响较大,在DL A为2mm时,熔深达到最大。离焦量主要是通过影响能量密度来影响熔深和熔宽,在离焦量为+2mm时熔深达到最大,不同于单独激光焊负离焦时熔深最大。焊接速度有一个合适的范围,在这个范围内随着焊接速度的增加,熔深熔宽减少。送丝速度对复合焊的焊缝形状影响最大,送丝丝度较小时焊缝形状类似于单独激光焊;送丝速度过大电弧等离子体屏蔽激光,焊缝形状类似于MIG。激光的倾斜角度对复合焊的焊缝熔深熔宽也有一定的影响,当激光的倾斜角度为10oC时,熔深达到最大熔宽最小。更多还原

【Abstract】 The effect of laser-MIG hybrid welding parameters,including the distance between laser and MIG arc,laser beam defocusing,welding speed,the types of arc and the angle of the laser inclining,on the weld geometry,is studied.Results indicate that the distance between laser and MIG arc is a very important parameter.When the distance between laser and arc equals to 2 mm,the weld penetration reach the max.Laser beam defocusing,which decides power density,can affect the penetration and the width of the weld.When the defocusing length is +2mm,the penetration reaches the maximum value,which is different from laser welding where the penetration reaches the maximum value when the defocusing point is negative.The welding speed has a suitable range,in this range the penetration and the width of the weld reduces with increasing speed.Wire feeding speed is the most important parameter.When wire feeding speed is low,the weld geometry is similar to that of laser welding.When the wire feeding speed is very high,the weld geometry is similar to that of MIG welding.Inclined angle of the laser also attributes in a certain degree to affect the penetration and the width of the hybrid welding weld.When the inclined angle is 10°,the penetration reaches the maximum value and the width reach the minimum value.更多还原