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Title:
A PRODUCING PROCESS FOR A SPIRAL COMPOSITE STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2009/003325
Kind Code:
A1
Abstract:
A producing process for a spiral composite steel pipe comprises steps as follows, (1) selecting a strip coil according to the diameter of the composite pipe (S1), (2) unwinding (S2), (3) leveling (S3), (4) edge milling (S4), (5) pipe forming (S5), (6) inner and outer welding (S6), (7) crack detecting (S7), (8) cutting at a predetermined length (S8), (9) flat head chamfering (S9), (10) putting in storage (S10), wherein a composite bimetal coil of stainless steel and carbon steel is used as the metal coil in step (1), and a stainless welding rod is used for welding in step (6). The process is easy to carry out and may be apply to a conventional spiral pipe making machine set for producing the composite metal pipe.

Inventors:
YAN, Mengjie (Room 301, Building of Guangdong Science and Technology OfficeNo.171, Lianxin Road, Yuexi, Guangzhou Guangdong 0, 518000, CN)
严孟杰 (中国广东省广州市越秀区连新路171号广东省科技大厅大楼301, Guangdong 0, 518000, CN)
Application Number:
CN2007/002869
Publication Date:
January 08, 2009
Filing Date:
September 29, 2007
Export Citation:
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Assignee:
YAN, Mengjie (Room 301, Building of Guangdong Science and Technology OfficeNo.171, Lianxin Road, Yuexi, Guangzhou Guangdong 0, 518000, CN)
严孟杰 (中国广东省广州市越秀区连新路171号广东省科技大厅大楼301, Guangdong 0, 518000, CN)
International Classes:
B21C37/14; B21C37/12; B23K1/18
Foreign References:
CN1748932A2006-03-22
US3735478A1973-05-29
CN1178152A1998-04-08
JPH08229685A1996-09-10
JPH05293661A1993-11-09
JPH0890239A1996-04-09
Attorney, Agent or Firm:
SHENZHEN QIANNA PATENT AGENCY LTD. (Jian HU, Room 601 West Unit,Xincheng Building, Shennan Road Central, Futia, Shenzhen Guangdong 1, 518031, CN)
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