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Low temperature welding of titanium colored coated stainless steel

My customer is welding small titanium colored coated stainless steel pieces. They are fabricating dimensional or channel letters for signs. When they used flux-cored electrode they observed discoloration of the coating. Are there any better welding techniques or media they should be investigating? Lead based rods are not acceptable.

Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas
2007

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First of two simultaneous responses -- 2007

When you say welding, you are talking HIGH temperature. If you include brazing but no lead, I would look at hard silver soldering.
Terribly time consuming, but I have seen TIG welded parts that were "stitch welded" so that there was not a great deal of heat at any one place at any one time. I did not like it, but I have seen SS cooled with a cloth wrapped dry ice and then welding continued for a short distance.Welding in an argon filled bubble might hold down the discoloration. Personally, I do not think that stick will work for almost all welders.

James Watts
- Navarre, Florida

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Second of two simultaneous responses --

Please let me re-state the original question. Customer is soldering using lead free solder. Problem seems to be with the flux solution used in the soldering process. Is there a flux solution available that will not affect titanium color coated stainless steel? Thanks.

Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas
2007