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Message: <blockquote data-quote="ntsqd" data-source="post: 27431" data-attributes="member: 222">I can vouch for welding copper with and w/o silicone bronze filler. It's a trick, but once you get it figured out it's not too hard.One other thing that may have caused the switch to GTAW welding of 4130 is the weld purity issue. Critical aircraft parts are welded with a trailing cup. This allows the weld and HAZ to cool further while still covered by the shield gas. This would be hard to do with Oxy-fuel. The by-products of the Oxy-fuel combustion are bound to have an effect on the metalurgy of any metal at a temp above the critical temp. GTAW only effects the crystalline structure of this metal, it doesn't add minute amounts of other elements (like Carbon) as is at least possible with Oxy-fuel.TS"It only seems kinky the first time"-- Bumpersticker seen in Lost Wages</blockquote>