Method of welding wallpaper alloy an arc welder modified to prac

Details Method of welding wallpaper alloy an arc welder modified to prac Method of welding wallpaper alloy an arc welder modified to prac

1996-07-15

1998-04-21

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913031, B23K 910

Patent

active

057420297

ABSTRACT:
A method of and welder for welding a corrosion resistant, wallpaper alloy to the inside surface of a vessel wall formed from a corrosion susceptible steel sheet after the wallpaper alloy has been affixed to the inside to provide an exposed seam of wallpaper alloy extending in a given path wherein the method and welder comprising moving a welding wire toward the seam, melting and depositing the welding wire onto the seam along the path by a short circuit arc welding process of the type having a welding cycle with a short condition and an arcing condition, which arcing condition constitutes a plasma boost portion with a set peak current level followed by a plasma portion with a current decreasing from said peak current level toward a set background current level with a given time between the plasma boost portion and the short condition andsetting the length of time of the plasma portion of the arcing condition to a value greater than 25% of the given time or greater than 2.0 ms.

REFERENCES:
patent: 4639576 (1987-01-01), Shoemaker
patent: 4954691 (1990-09-01), Parks et al.
patent: 4993621 (1991-02-01), Koy
patent: 5001326 (1991-03-01), Stava
patent: 5054980 (1991-10-01), Bidefeld
patent: 5148001 (1992-09-01), Stava
patent: 5494614 (1996-02-01), Gohara
Brochure "Welding Journal--New Power Sources Cut Spatter, Fumes" Published by the American Welding Society.

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