How to ensure and improve welding quality of submerged arc welded steel pipe

- Jan 30, 2019-

Special topics on welding arc-starting plate for submerged arc welded steel pipe:

In advance before the end of the welding steel pipe (1) the edge milling welding arc plate (2) to find the same arc plate and the thickness of the parent metal, arc plate to choose the width of the edge milling machine roller rolling to (the edge milling machine roll and knife plate distance, not too narrow, later to the horizontal push) (3) the method of welding arc plate: will first arc plate processing a single groove.Available band saw, saw cut (4) and then welding the arc plate in the steel pipe pre-welded into the end of the steel plate (the front end can not be pre-welded) with a bow clip red copper pad or fire brick, ceramic pad.Use the reinforcement board to make a reservation for bending first.(5) solid welding with carbon dioxide gas protection.Welding arc plate must be in the milling process before, (6) in the pre-welding machine pipe end manual welding, the requirement of the shorter the better (should be kept within 2 cm, otherwise prone to welding), in order to prevent steel pipe cracking: do not allow long welding, long welding should be close to the automatic welding.(7) the pipe end can be welded on the arc plate to prevent the pipe from cracking. If the opening of the arc plate is too large, special tools can be used to eliminate it before welding.(8) after the pre-welding of the steel pipe, the pipe end shall be completely cut with the cutting gun, and then the single groove arc plate shall be welded, and the arc plate shall be firmly welded to prevent the air gouging during the internal and external welding and the cracking of the steel pipe when the manual welding seam is removed.(9) manual CO2 gas shielded wire shall be 0.8-1.2mm in diameter, rather than 1.6mm in diameter.The quality of welding arc-starting plate directly affects the quality of welding seam at the end of steel pipe.(10) for thick wall welding, the horizontal inclination Angle of the trolley shall be adjusted. For thick wall welding, uphill welding or horizontal welding shall be selected, and the welding wire shall be tilted backward.(11) for thin-wall welding, the horizontal inclination Angle of the trolley should be downward sloping welding wire, but the final need to see the appearance of the weld molding and internal quality, (12) the length of the wire, double wire welding is 6-8 degrees in diameter, single wire welding is 8-10 times the diameter.

The arc-starting plate plays an outstanding role in the welding process of submerged arc welding steel pipe, which effectively ensures the quality qualification rate of submerged arc welding joints.Good starting welding is an important procedure for successful submerged arc welding.


Product Description
Product Name
Casing Pipe for Oil
steel plate
4 1/2", 5", 5 1/2", 6 5/8", 7", 7 5/8", 9 5/8", 10 3/4", 13 3/8", 16", 18 5/8"
API 5CT, API 5L, ASTM A106-2006 etc.
Wall thickness
6.35 - 12.70 mm
Thread type
STC, LTC, BTC,VAM equivalent premium connection
in bundle or bulk
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Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.

Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects

Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555


Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners