When welding large pieces of reactive metal, trailing shields keep the heat-affected zone under an argon shield.
Welding titanium, stainless steel, and other reactive metals releases gases that cause oxidation, coking, and hydrogen embrittlement. Welding in an argon-filled enclosure is one solution to the problem, but with large components and structures, welding in an enclosed environment is not always possible. To combat this problem, Cob Industries Inc., Melbourne, Fla., has developed a range of trailing shields.
The trailing shields keep the welded joint and heat-affected zone under an argon shield longer than normal, allowing faster welding and eliminating the risk of oxidation and hydrogen embrittlement.
Applications for trailing shields include welding of gas turbine and aerospace engine housings and components; titanium and duplex pipes for onshore and offshore pipeline and riser applications; titanium components for racecar structures; stainless steel, titanium, and duplex tanks and vessels for the petrochemical industry; and medical components.
The Cob Shields can be fitted to any make or size of manual or automatic GTAW, PAW, or GMAW welding torch and can be delivered for use on any diameter of pipe or vessel and for welding inside or outside. They are also available in a flat format for welding sheet and plate.