| 摘要 |
A gas shielding arrangement and method is disclosed for use with tungsten inert gas (TIG) welding and the like, consisting of an inner, primary flow of an inert gas such as argon, passing about the electrode and weld area, and an outer radially spaced secondary flow of hydrogen gas, completely enveloping the flow of inert gas and ignited by the welding arc to provide a flow of burning hydrogen gas which consumes the atmospheric oxygen penetrating into the flow to minimize oxidizing of the weld metal. The flow of hydrogen gas also minimizes dissipation of the inert gas to conserve and improve its shielding effect. The heat generated by the burning hydrogen heats the portions of the workpiece surrounding the weld to produce superior welds with improved grain structure by minimizing the quenching effect of the weld created by conduction of the weld heat into the surrounding metal.
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