Apparatus for producing galvanized tubing

Details Apparatus for producing galvanized tubing Apparatus for producing galvanized tubing

1991-03-19

1992-05-19

Briggs, William

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

228147, B23P 1100, B21K 3106

Patent

active

051135574

ABSTRACT:
An improved method of manufacturing galvanized steel tubing from steel strip having at least one galvanized surface, which surface becomes the exterior surface of the tubing is provided. In the method of the invention, after the steel strip is roll-formed and welded to complete the tubing and the welded seam is scarfed to remove irregularities, a quantity of an acid solution is applied to substantially only the scarfed area to react with oxidized metal, and the rinsed, leaving the non-scarfed galvanized exterior surface intact. The tubing is then heated to a temperature sufficient to cause the galvanized coating of the exterior surface to begin to flow and the tubing is regalvanized to produce an improved galvanized exterior surface, which is resistant to cracking along the scarfed area. Also provided is an apparatus for applying a pickling acid solution to substantially only the scarfed area of continuously formed tubing, which apparatus may be used to modify conventional continuous roll-forming mill tubing production lines to perform the method of the invention.

REFERENCES:
patent: 3122114 (1964-02-01), Kringel et al.
patent: 3733670 (1973-05-01), Troughton
patent: 3768145 (1973-10-01), Ostrowski
patent: 3827139 (1974-08-01), Norteman
patent: 3845540 (1974-11-01), Rossi et al.
patent: 3927816 (1975-12-01), Kakamura
patent: 4082212 (1978-04-01), Headrick et al.

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