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Steel for welding method
作者:管理员    发布于:2013-05-23 11:33:46    文字:【】【】【

Welded steel pressure on operating the new technology - molten welding

 

  Steel gas pressure welding technology after decades of development, has become a very mature and stable steel construction process. 2003 China Ministry of Construction promulgated the "steel welding and acceptance of" new industry standards, promote the use of China has created a "molten welding method," the latest operating technology. Based on years of field trial and molten new method of gas pressure welding process, than the previously used method of solid plastic form of welding is easier to grasp, solve operational problems of workers with higher technical requirements; and China to create a new process eliminates the need for grinding end part of processed steel cutting processes, simplifying the operation process, greatly improve the speed of welding, and more energy-saving environmental protection.

  Steel gas pressure welding machinery and equipment, the Chinese-made machine also been several generations of improvements, continuous improvement, at present, China's new generation steel gas pressure welding machine, has overcome the shortcomings of earlier problems, very mature and stable, has become the world's advanced construction steel welding machine equipment of choice. Looking forward to the new Chinese steel gas pressure welding machine, your business can play a greater role in the take-off!

The pressure of a gas welding steel welding operation process melting state

1 basic principle and application scope

Using oxygen and acetylene (or oxygen and liquefied petroleum gas) flame, and for both root reinforced seams heat, so as to meet the basic melting state, exert appropriate pressure, forming a head butt welding metalforming welding method.

Suitable for industrial and civil buildings, structures of reinforced concrete structures Ф 12 - the 40mm level-I, grade, level and parts imported steel, in the vertical and horizontal and inclined position reinforced joint docking welding.

 2. materials and equipment required

 (1) reinforced: must be reinforced factory certificate and complex test certificates and performance index comply with the GB13013-91 the reinforced concrete with hot-rolled light round "and GB1499-91 reinforced the reinforced concrete with hot-rolled ribbed reinforcement" regulation. When two reinforcing steel bar diameter not phase and at the same time, its two reinforced diameter by must not be more than 7mm. When using different batches or other varieties and specifications reinforced gas pressure welding should be carried out when the steel welding performance tests. Qualified rear can adopt.

(2) used in the gaseous oxygen should comply with quality GB3863 prescribed in the I class or class level of technical requirements.

 (3) acetylene: need to use cylinders pack dissolved acetylene, its dramatically must in volume ratio) above 98% (, phosphine content must not be more than 0.06%, hydrogen sulphide levels must not be more than 0.1%, moisture content must not be more than 1g/m3, acetone content should be no more than 45g/m3.

(4) liquefied petroleum gas (LPG) must comply with the relevant national standards regulations.

3. major equipment installations

Oxygen device (oxygen), acetylene cylinders (or liquefied petroleum gas cylinders), gas pipes, talkative HuanGuan welding torch (or weigh talkative HuanGuan heater), pressure machine (or said that oil pump, divided into manual type electric type two), welding jigs (or say fixed fixture, activity fixture), auxiliary equipment (toothless saw or cutting machine, fixtures, v-shaped cushion block, wrench, reinforced correction device).

4. Operating conditions

 (1) welding workers must hold operation certificate for posts, different levels of welding workers have different assignments allowed scope shall conform to the state standards regulations. Auxiliary workers should have reinforced gas pressure welding related knowledge and experience, master pressure machine operation performance and reinforced installation quality requirements.

(2) welding operations if encounter weather no rain, snow covered no homework; Winter temperatures in - 13 degrees below without insulation measures unfavorable homework.

(3) welding operation, pitched before operating shelf. The construction site and the nearby there shall be no inflammable, explosive, equipped with on-the-spot fire-fighting equipment and care to prevent fire, explosion and personnel burns accidents.

 (4) officially welding, must undertake the site conditions before next reinforced gas pressure welding performance test, welding test pieces after appearance inspection, tensile test and bending test, and determined the welding process parameters.

 (5) well reinforced materials in work, calculation cutting length should be considered when the welding joints of compression value. Truncation reinforced, safeguard the flatness and reinforced truncated switchgear.it part does not have to bending deformation.

 5 Operating Process

Melting state welding method operation process flow diagram

Steel cutting equipment to prepare materials Check the machine equipment  Install fixture and answering long reinforced (two root prepare welding steel should stay 3-5mm aperture) Heating reinforced end aperture  Reinforced end to melt condition, ends a convex state, rapid pressure After molding remove during production Check the quality of welding

(1) reinforced cutting preparation: calculation of steel cutting length should be considered when the welded joint of compression value, each joint of compression is around a welding reinforced the diameter of 1.0-1.2 times length. Try to keep to end relatively flat steel welding, and axis verticality deviation shall not exceed 3 millimeter; If there is a bending distortion should be removed.

 (2) check welding equipment:

Heater: inspect heater shoot suck ability, maintain normal, check every shot suction valve effective flexible, each place there shall be no leak, Then lit heater check flame shape, must make every eruptive mouth outbursts of flame, and in the center form a annulus plane.

Fixture: check fixtures clamp mouth V type cushion block is suitable for welding the diameter steel, bolts, nuts, rotation is flexible, pay attention to each rotating parts charging lubrication oil. Clamping fixture should be flexible, it is easy to operate.

Pump: check the entire oil pump system is normal, hydraulic oil is enough, lack of oil must follow the instructions charging hydraulic for oil (shall not use other oil filling replaced), hydraulic oil filter, prevent special must be brought into the pump inside. Sundry Oil cylinder piston reset flexible, whole oil-way system can not have leakage, due to the tubing micro craze and ejective oil mist cause deflagration accident.

 (3) installation fixture and answering long reinforced: in waiting for welding steel admiral fixture installation is firm, two root welding of reinforced with 3-5mm gap, gap not that is too small or two reinforcing steel bar, and ensure the equal center degrees. Up and down the relative amount of reinforced axis eccentric (e) must not be more than reinforced of nominal diameter 0.15 times, fine diameter reinforced also must not be more than 4mm.

(4) heating reinforced gap:

The first to use neutral flame heating, in heater does not leave reinforced aperture, under the precondition of uniform circular arc swinging, make do every heater welding steel mouth fire turns close to crack. Until reinforced end to melt condition, adhesion material with melting trickle away, at the end of the present bulging mode shape, immediately rapid compression, extrusion molten metal, and pier coarse forming. In the beginning, can be appropriately reduced pressurized oxygen supply.

Note: in pressurized to wide mobile heaters. Make upsetting area biggest diameter for reinforced the diameter of 1.4-1.5 times to stop when the compression, use flame blow roast upsetting regional surface for a few seconds, make upsetting raised portion, uniform gently five crack. Use oxygen and liquefied petroleum gas flame to soldering, should be appropriately increase oxygen consumption.

 (5) preliminary check welding quality: mainly appearance inspection, should look to make the two reinforced concentric, joint part pier coarse length and diameter in conformity with the provisions, the surface is flawless .

 If there is a slight welding problem can timely remedial measures. For example: upsetting a diameter of less than, can continue to heat compression, Reinforced different heart while not cooling use correction tools straightening correct.

 (6) after molding remove fixture: stop pressure and heating, after waiting for reinforced joint red disappear, namely joint present wine (about 400-500) can dismantle fixture, continue to natural cooling. Attention: cannot use water and other substances forcibly cool cutting.

(7) press formulary partial cut take joint inspection welding quality including inspection and mechanical properties test for two parts.

Technical parameters of the oxygen and acetylene gas
Technical parameters of the oxygen and liquefied petroleum gas (propane gas)

Steel gas pressure welding machine, according to the fixture is divided into five types:

Type 1 welding machine is top tight type model, the welding range 16-32 mm.

Type 2 welding machine is hold type model, the welding range 12-25 mm.
Type 3 welding machine is top tight type model, the welding range 10-22 mm.

Type 4 welding machine is hold type model, the welding range 20-32 mm.

Type 5  welding machine is top tight type model, the welding range 12-28 mm.

 

Blu-ray on the welding machine: Web http://www.duijieji.com  or http://www.duihanji.cn

Email: languanghj@yahoo.com.cn  or languanghj@163.com or 619129487@QQ.com

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Address: Zhengzhou City, Henan Province, China

Reinforced gas pressure welding site operation screen connection

http://you.video.sina.com.cn/languanggs

 
 
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