FIELD: metallurgy.
SUBSTANCE: backing is implemented with shaping groove and allows openings for fixation in welding fixture. Under shaping groove it is implemented parallel hole for feeding of protective gas. In mentioned opening it is located spring loaded piston. Parallel hole along the full length is connected by channel to shaping groove. Piston is installed with ability of its movement in the process of filling of shaping groove by molten metal and providing of feeding of gas to the welding place.
EFFECT: shaping of back of weld in protective gas medium that increases quality of weld seam.
4 cl, 3 dwg
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