焊工 电焊工 工人 answering as an Engineer 焊工 is better. 电焊means electric welding 焊means welding 所以电焊是焊接工艺的一种 So we technically we often use 焊工，Because for most welders, they can handle with several welding processes such as electric welding, argon arc welding, laser welding.

這個人在焊接。

My pleasure, Helena. :)

Thanks so much dear phoebe

you mean the welder,right? 电焊工