To provide a production method which is useful in producing a metal welding joint composed of different metals of titanium and aluminum that is considered difficult to form while attaining good joining strength, and also provide such a welded joint.

TIG welding method is applied when the joint is produced by welding titanium or titanium alloy with aluminum or aluminum alloy. AC power supply or DC power supply containing reverse polarity component of 30% or more is used as welding power source, and Al-Si based alloy is employed as a welding material.