Parameters for manual welding are similar under similar welding conditions. If slower welding speeds are desirable, amperage must be reduced proportionately. Generally speaking, the lowest heat input consistent with good weld properties is desirable in welding titanium. It is good practice to weld test samples to optimize parameters for a particular welding application before committing material and manpower to the job. In addition to clean joints and weld wire, proper parameters, and proper inert gas shielding, welder technique requires attention when titanium is being welded.
Improper technique can be a source of weld contamination.
Before starting an arc in welding titanium, it is good practice to prepurge torch, trailing shield and backup shield to be sure all air is removed. Whenever possible, high frequency arc starting should be used. Scratch starting with tungsten electrodes is a source of tungsten inclusions in titanium welds. On extinguishing the arc, the use of current downslope and a contactor, controlled by a single foot pedal, is encouraged. Torch shielding should be continued until the weld metal cools below 800 degrees F. Secondary and backup shielding should also be continued.