Method for eliminating residual magnetism in pipe-blank for weld

Details Method for eliminating residual magnetism in pipe-blank for weld Method for eliminating residual magnetism in pipe-blank for weld

1977-03-10

1978-08-15

Truhe, J. V.

Electric heating

Metal heating

Of cylinders

219123, B23K 3106

Patent

active

041075030

ABSTRACT:
After longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the arc welding process which comprises using direct electric current supplied to a consumable electrode through a cable as the welding current, the polarity of said consumable electrode applied for said longitudinal seam-welding is switched over to the opposite polarity, an arc from said consumable electrode is ignited again on a tab plate attached to the end of said pipe-blank on the completion side of said longitudinal seam-welding to cause a direct electric current for eliminating magnetism to flow through said cable in the opposite direction to that of said direct electric current for welding, thereby eliminating residual magnetism in said pipe-blank produced by said direct electric current for welding flowing through said cable introduced into said pipe-blank during said longitudinal seam-welding.

REFERENCES:
patent: 1947077 (1934-02-01), Chapman
patent: 2152194 (1939-03-01), Jones
patent: 2564396 (1951-08-01), Darner
patent: 2677802 (1954-05-01), Irwin

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