Welding accessory developer Huntingdon Fusion Techniques® (HFT®) has released a range of Weld Trailing Shields®, designed for extended inert gas coverage during titanium and stainless steel welding to prevent oxidation.
The lightweight tool, available in the US from COB Industries, can be easily manoeuvred around the pipe joint during welding and is connected to an argon (Ar) gas source with extra Ar flooding and covering the heat-affected zone next to the weld. As the welding torch is moved forward, the weld remains under the Ar gas shield until the welded metal has cooled below its oxidation temperature.
A spokesperson from COB Industries explained, “The Trailing Shield is connected to the Ar gas supply and it diffuses gas out evenly without turbulence through the multi-layers of stainless steel mesh built into the body of the shield.”
“At each side, removable silicone rubber side shields provide a barrier to prevent the Ar escaping sideways and remaining over the weld metal. These silicon shields are a consumable and are replaceable as they become worn.”
A major advantage is that the welding torch can be carried at 90º to the weld during manual operations. Each Trailing Shield is delivered with a variable diameter connector so that it can fit any size of tungsten inert gas/gas tungsten arc/plasma arc (TIG/GTAW/PAW) welding torch for manual or mechanised welding.
They are available for any diameter of tube and pipe from 17mm and up and are manufactured in flat formal for sheet metal welding.