A new machine has been developed to remove heat discoloration from stainless steel welds, safely, cost effectively, and in a way that is “environmentally friendly.” The product has been available in Australia by its developer, Ensitech, but it has been given a wider launch at the MACH 2010 trade show in England earlier this month.

The TIG Brush^® removes “heat tint” by using heat and electricity to paint a non-toxic cleaning fluid on the weld. The fluid is activated as it is heated by the brush and removes the discoloration. The brush’s high temperature also removes iron oxide residue produced by the welding process and restores the steel’s protective chromium oxide layer – therefore removing the need for a separate ‘passivation’ process.

In the U.K. and E.U., Ensitech has partnered with Vickers Laboratories to supply the fluids used in the process.

The development represents an alternative for ‘pickling paste’, the acid mixture that is the most common way to remove heat tint, but also a toxic substance. Ensitech says its six-years-in-development product also eliminates the need for ‘passivation,’ or restoring stainless steel’s corrosion-resistance after welding. And, the brush will not affect the surface finish of the stainless products being welded.

Ensitech general manager Clive White stated: “Developing the brush was the most difficult part. It had to conduct electricity, withstand high temperatures and last a long time. The machine is easy to use, highly portable and offers the first really practical solution for cleaning welds.”