工艺参数对氩弧熔覆焊缝尺寸及组织影响的研究

Effect of process parameters on size and microstructure of argon arc cladded weld

通过控制氩弧熔覆的焊接电流、焊接速度、氩气流量、电弧长度等参数,在Q235钢上以镍基合金粉末来制备预制块进行氩弧熔覆。利用DSM200型读数显微镜测量每个试样焊缝熔池的熔深及熔宽;在LEICA DM4000M的立式金相显微镜上观察其金相组织。通过对比各参数可以发现,焊接电流影响最大,焊接速度和氩气流量对焊缝尺寸及组织的影响较小,进而确定Q235钢氩弧熔覆的最佳工艺参数为:焊接电流160 A,焊接速度115 mm/min,氩气流量9 L/min,电弧长度3.5 mm。

Through the control of welding current,welding speed,argon flow rate and other parameters in argon arc cladding,the precast block prepared with nickel base alloy powder was cladded on Q235 steel. Penetration depth and weld width of weld pool for each sample were measured using DSM200 type reading microscope. The vertical metallographic microscope of LEICA DM4000 M was used for metallographic observation. It is found that the influence of welding current on weld size and microstructure is most,while welding speed and argon gas flow are less,and the optimal technological parameters of argon arc cladding for Q235 steel is as follows：welding current 160 A,welding speed 115 mm/min,argon flow rate 9 L/min,and arc length 3.5 mm.