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TIG welding of high-alloy stainless steels in a reducing gas mixture for applications in power economy
Tušek, Janez, 1952-
TIG welding is a welding process which is very often used in construction and maintenance of installations in power economy. The paper deals with TIG welding of high-alloy stainless steel in a ...reducing shielding gas mixture. The reducing gas mixture may be obtained by adding a reducing gas such as hydrogen to a neutral gas such as argon. The paper treats TIG welding in argon with 0.5 to 20 percent hydrogen addition. A description of the influence of hydrogen in argon on the static characteristic of the arc, temperature distribution in the arc, the volume of the material melted as well as the weld shape and weld surface quality is given. Experimental studies showed that hydrogen exerts a major influence on productivity of welding, the weld shape and weld surface quality. The hydrogen addition to argon produces arc constriction, concentrates energy and, consequently, increases arc power. Higher arc power produces stronger melting of the parent metal and the filler material while the quanlity of the welded joint is maintained. Hydrogen being a reducing gas has a strong affinity for oxygen, that is to say that there are no unwanted oxides on the weld surface and its vicinity. The argon-hydrogen mixture may be used for welding of austenitic, ferritic and martensitic high-alloy stainless steels. For manual TIG welding it is recommended to add 5 to 12 percent hydrogen to argon as a shielding gas.
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