Welding of high-purity process gas lines for the semiconductor industry is the largest single application of automatic orbital GTA welding. Millions of welds have been done using this technique. However, there are still differences in methods and techniques from user-to-user to achieve the goal of an ultra-high purity gas delivery system. The standard weld for 1/4 inch diameter (OD) tubing is a single-pass weld with pulsed current. Automatic tube welding consistency is obtained through the use of controlled internal I.D. pressurization during the welding process (accomplished by the use of sensitive pressure gauges to measure the pressure inside the tube).
Find out how Dynamic Systems, Inc., a mechanical contractor that installs high-purity piping systems for semiconductor process gas lines, experimented and succeeded with the use of pressurization during welding to control the inner weld bead profile while using Arc Machines' orbital tube welding equipment.
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