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2 417 851

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IPC

B21C37/08(2006-01-01)

B23K31/02(2006-01-01)

B23K33/00(2006-01-01)

(21) (22)

Application

2008118219/02, 2006-11-09

(24)

Start date

2006-11-09

(22)

Actual filing date

2006-11-09

(45)

Published

2011-05-10

(72)

Inventor

Kenmoti KazukhitoOkabe TakatosiEkojama KhirojasuSugimoto JudziFudzioka EsifumiSakata KehjInoueh TomokhiroSirosava KhirojukiEgi MotoakiNisida JasuoMurakami Munehesi

(73)

Holder

Dzhfe Stil Korporejshn

PRODUCING TUBES WITH HIGHER PROPERTIES OF WELDED SEAMS BY CONTACT RESISTANCE WELDING Russian patent published in 2011 - IPC B21C37/08 B23K31/02 B23K33/00

Abstract RU 2417851 C2

FIELD: process engineering.

SUBSTANCE: invention relates to contact welding and may be used in producing pipes for oil wells. Strip 20 is formed and its edges are jointed together and subjected to contact resistance welding to produce pipe. In forming, rounded edge or edge inclined from perpendicular by 25° to 50° is produced in pass arranged directly ahead of contact resistance welding machine. Note that perpendicular length from inclination start to end equals 20% - 40% of strip thickness on, at least, one side of the strip and on the side of its top or bottom surface.

EFFECT: high quality of welded joint.

12 cl, 11 dwg, 6 tbl

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RU 2 417 851 C2

Authors

Kenmoti Kazukhito

Okabe Takatosi

Ekojama Khirojasu

Sugimoto Judzi

Fudzioka Esifumi

Sakata Kehj

Inoueh Tomokhiro

Sirosava Khirojuki

Egi Motoaki

Nisida Jasuo

Murakami Munehesi

Dates

2011-05-10—Published

2006-11-09—Filed