One, what is helix solder canal?

Helix solder is in charge of, full name helix seams canal of the solder that bury arc, it is steel of structure of element of carbon of will low carbon or metal strip of steel of low alloy structure by proper corkscrewed yarn point of view (make shape horn) roll into provides semifinished product, receive tubal seam welding next rise the steel tube that makes.

Its big exterior feature is thatGyroidal welding line.

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2, basically characteristic

The characteristic that helix solder is in charge of is very bright, have distinct advantage already, also have its limitation:

Advantage:

1. Requirements is large, with makings is agile:

• Can useThe metal strip of same width, shape through the change angle, production gives the steel tube of a variety of diameters.

• The diametical range that can produce is big, at present home can be accomplished3.6 metersBigger even, canal of straight seam welding is likened to this hard.

Cost is low, economic benefits is good:

• Raw material (metal strip) the price normally the armor plate under coequal norms, manufacturing technology is successional tall, make total cost inferior.

Bear the weight of force is reasonable:

• Because welding line is gyroidal, avoided welding line to go up point-blank at centrally, make steel tube is in advocate stress just bears the weight of to what go up force is relatively even.

Dimension precision is tall:

• Use hot-rolling metal strip to serve as raw material, its wall large common difference wants than armor plate normally all, and distributing evener.

Limitation:

1. Welding line is long:

• Photograph comparing is in charge of at straight seam welding, the steel tube of same length, length of its welding line increased 30% to 100% . The probability that this means occurrence weld defects is opposite taller.

Internal stress is greater:

• Shape and solder the process can remain in body greater internal stress, to steel tube bear press ability and dimension stability to have certain effect.

Manufacturing rate is slow:

• Because be helix advance gradually,shape, its produce rate normally under high quality seam canal of the solder that bury arc continuously.

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3, basically workmanship

Its produced technological process to mirror its characteristic clearly: → of leveling of → of open a book to read cuts edge → to send to → of edge of solder → mill → bends → to shape beforehand → of the solder outside → of the solder inside → cuts off → finishing → to examine

Among them, ShapeAndInside and outside buries arc solderIt is two link of core.

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4, basically use a field

Helix solder canal depends on his large requirements and cost advantage, apply in the following domain extensive:

• Low-pressure fluid is carried:

• Water is carried: The city irrigates for drainpipe net, agriculture canal, large water conservancy project.

• Light gas to carry: Use at in low-pressure city lights tracheal net.

• Oil is carried: Inchoate carry cop with the oil gas of a few low pressure.

• The structure props up a domain (this is its very main market):

• Pile canal: The fundamental pile of building, bridge, dock is in charge of, this is one of applied markets with helix solder big canal.

• The column that prop up: The pillar that is used at bridge mound column, large workshop.

• Other sphere:

• Wind-force generates electricity: Use at making wind- driven generator the canister section of tower canister (part) .

• Ripple is in charge of contain: Use at the culvert of highway, railroad.

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5, the deepness that is in charge of with straight seam welding contrasts

• Helix solder is in charge ofBe located in " low cost " and " medium function " quadrantal, yesCost is sensitive model, large requirements demandgood choice.

• Straight seam welding is in charge of (LSAW)Locate forHigh-powered, Gao Ke relies on a gendersolution, but the price is higher also.

Besides the fixed position in chart, they still have the following and crucial difference on technicality:

Feature	Helix solder is in charge of	Seam canal of the solder that bury arc continuously
Welding line configuration	Corkscrewed yarn	Or many point-blank
Raw material	Hot steel rolling is taken	Medium large board
Caliber flexibility	Tall(the strip steel with same width is producible the canal of different diameter)	Low(diameter of steel tube of decision of armor plate width)
Large requirements	Great(can amount to 3 rice above)	Greatly (normally ≤ 1.6 meters)
Welding line length	Very long (the 1.3-2 that grows to be in charge of times)	Weak point (agree originally with Guan Changji)
Leftover stress	Relatively greatly	Lesser (after passing machinery enlarge diameter especially)
Bear control capacity	Commonly	Tall(apply to high pressure especially)
Mainstream standard	GB/T 9711 PSL1, SY/T 5037, GB/T 3091	GB/T 9711 PSL2, API 5L
First selection applies setting	Low pressure is carried, pile, the structure is propped up	Oil gas of high pressure, large requirements carries artery, important structural member