One, what is canal of straight seam welding?

Straight seam welding is in charge ofIt is to point to make preform with armor plate or metal strip, shape through be being seamed continuously craft, make its welding line is as parallel as steel tube axes linear, use the steel tube that solders differently to the method solders and be become next.

Just as its name implies, its core feature is thatStraight fore-and-aft welding line.

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2, basically characteristic

Canal of straight seam welding holds concurrently the economy that had solder to take-over and be close to the dependability that seams a canal at notting have, its characteristic includes:

1. Exceedingly good bear control capacity: Because its welding line is short and straight, and can use solder advancedly and solder aftertreatment craft, its bear control capacity very tall, apply to high-pressured operating mode especially.

2. Dimension precision is tall, the wall is large even: Make by flat preform, mural thick control is good, exterior quality beautiful.

3. Welding line quality is controlled easily and detect: Straight welding line facilitates undertake automation solders to detect with the nondestructive such as ultrasonic, quality is stable and reliable.

4. Manufacturing efficiency is tall, cost moderate: Seam a canal at notting have relatively, manufacturing cost is lower; Relative to Yu Luo solder coming back is in charge of, on certain standards quality and efficiency have an advantage more.

5. Caliber range is wider: Can produce arrive from medium caliber the tubal material of large requirements.

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3, ultimate cluster (by workmanship)

This is the crux that understands canal of straight seam welding, the basis solders of craft different, main component is two kinds big:

1.Seam continuously high frequency resistance welding is in charge of

• English abbreviation: ERW

• Production principle: After metal strip cold turn shapes, those who use high frequency electricityCollect skin effectAndProximity effect, make instant of brim tubal semifinished product heats to melt condition, undertake below the action of compression roller pressure solders.

• Characteristic:

• Without welding wire: Solder the process does not add any fill metals.

• Welding line is narrow, Hot influence area is all.

• Manufacturing efficiency is extremely tall.

• Through online heat treatment, welding line function can comparative with mother capable person.

• Main application:

• In low-pressure fluid duct (be like water, gas, air) .

• The structure uses a pipe (like construction of scaffold, building) .

• The collect of finished product oil, natural gas is defeated by conduit.

2.Seam canal of the solder that bury arc continuously

• English abbreviation: LSAW

• Production principle: UseArmor plateMake raw material, bend edge hind beforehand in the course, shape through what differ means (see later development) shape, next interiorly and exterior useBury arc solderThe technology undertakes soldering.

• Characteristic:

• Solder quality is extremely high: Frit of the solder that bury arc is deep big, quality is stable.

• Producible large wall, large requirementsSteel tube.

• Welding line area has fill metal, mechanical performance is superior.

• It is oil gas grows those who be defeated by main pipelineBrunt.

• Main application:

• The oil of high pressure, large requirements, natural gas carries main pipeline.

• Pile of large structural member, haven.

• Bear press column of equipment, canal.

LSAW basis shapes the farther fractionize of craft:

• UOE solder is in charge of:

• Craft: Armor plate is passed firstUModel form of U of compressor strike out, reentranceOModel compressor is pressed into the circle, junior travel solders andMechanical enlarge diameter.

• Advantage: Quality is good, dimension precision is tall, leftover stress is little, it is the first selection that high-end cop is in charge of.

• Defect: Installation cost is huge.

• JCOE solder is in charge of:

• Craft: Armor plate is passedJModel, CModel, OModel much pace strike out, solder next and enlarge diameter.

• Advantage: Mould cost is low, manufacturing flexibility is good, suit production of much norms, all lot.

• Defect: Manufacturing efficiency slightly under UOE.

• Roller turn shapes: Bend continuously through forming machine of type of much sortie roller board shape, basically use at in caliber conduit.

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4, basically use a field

Straight seam welding is in charge of, especially LSAW, be modern industry " aortic " :

• The sources of energy is carried:

• Oil gas is long be defeated by conduit: Be like " enrage on the west east be defeated " wait for national level project, the majority is usedSeam canal of the solder that bury arc continuously.

• Marine conduit: Extremely tall to quality and security demand, LSAW is main alternative.

• Structural domain:

• Large construction: The truss structure of stadium house, airport.

• Bridge construction: Use as the steel tube concrete of pier and arch bridge arch costal region.

• Pile: Picket of foundation of architectural of dock, high level.

• The fluid is carried:

• The city manages a network: Conduit of water supply, heat addition.

• Industrial conduit: The craft conduit inside the factory.

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5, the deepness with other steel tube is comparative

To reveal straight seam welding more intuitionisticly the canal is in steel tube is familial medium fixed position, next graphs from " relative cost " and " function / dependability " two dimension are spent, be in charge of its and helix solder and do not have seamed a canal to undertake comprehensive contrast: From on the graph can see clearly:

• Helix solder is in charge ofFixed position is tall sex solution of valence comparing, large requirements, but function and dependability are relatively inferior.

• Straight seam welding is in charge ofOutstanding balance was acquired on cost, function and dependability, it is the first selection of a lot of high pressure, high strenth application.

• Without seam a canalRepresented the peak of function and dependability, but cost is high also.

Besides chart medium core locates, they still have the following and crucial difference on technicality:

Feature	Straight seam welding is in charge of (LSAW)	Helix solder is in charge of (SSAW)	Without seam a canal (SMLS)
Welding line configuration	One point-blank	One corkscrewed yarn	Do not have welding line
Raw material	Medium large board	Hot steel rolling is taken	Circle billet
Welding line length	Short (≈ canal grows)	Very long (times canal of 1.3-2 grows)	Not have
Bear control capacity	Very tall	Commonly	Tall
Leftover stress	Xiao (especially after classics enlarge diameter)	Relatively greatly	Not have (come from solder)
Caliber limits	Greatly (normally ≤ 1.6 meters)	Great(can amount to 3 rice above)	Xiao (large requirements is troublesome and expensive)
Cost is compared	Wait in	Low	Tall
Core application	High-pressured oil gas is trunk, important structure	Low pressure is carried, pile, the structure is propped up	Extrahigh voltage, high temperature, crucial equipment