Does anyone know the basis for the welding specification of polysilicon pipes, argon and electric jo

Argon welding is argon arc welding as the base, and the welding rod fills the cover surface. The inside of the general pipe with argon arc welding is clean, and a certain quality can be guaranteed, and the pores can be seen at a glance.

In order to avoid welding slag falling into the oil pipeline, the oil pipeline welding base must be welded with argon arc welding.

As for the filling and cover surface, it can be selected according to the thickness of the pipe wall, and below 5mm can be welded by full argon arc welding.

If the pipe wall is more than 6mm, argon arc welding can be used to lay the bottom and weld the surface.

Argon and electric joint welding to ensure the cleanliness of the pipeline.

This seems to be a hard and fast rule, and it should be implemented according to the design document.

From the regulations do not require argon arc welding, but the use of full welding penetration of the joint type, in order to ensure the quality of the general use of argon arc welding base welding, welding method should be selected according to the design requirements, if the design is not required, the general butt weld should be selected argon electric welding. Basis: Basic requirements for the connection of the main pressurized components of the "Boiler Safety Technical Supervision Regulations" (1) The main welds of the main pressurized components of the boiler (including the boiler barrel (pot shell), header, furnace bladder, recombustion chamber and the longitudinal and circumferential welds of the power station boiler starter (steam-water) separator, centralized descending pipe, steam pipe, head, tube sheet, furnace tank and foot ring, etc.) shall be fully welded butt joints.

……The connection between the pipe joint and the pot (pot shell), header and pipelineThe connection between the pipe joint and the pot (pot shell), header and pipeline shall be fully welded under the following circumstances: (1) In the strength calculation, when the opening needs to be strengthened by the pipe joint; (2) When the outer diameter of the pipe joint of Class A high pressure and above boiler is greater than 76mm; (3) A-class boiler centralized descending pipe joint; (4) When the descending pipe or its pipe joint is connected with the header (except for the descending pipe with an outer diameter of 108mm and a plug-in structure). ...The basic requirements for welding operations .........The following parts of argon arc welding should be used for argon arc welding priming

1) The connecting weld between the lower foot ring of the vertical shell boiler and the shell; (2) Butt welds of organic heat carrier boiler pipes and pipes: (3) Butt welds of oilfield steam (water) injection boiler tubes. The combined welds of Class A high-pressure and above boilers, boiler barrels, headers, and pipe joints, the butt welds of the heating surface pipes, and the butt welds of pipes and fittings should be used for argon arc welding when the structure allows.

1. According to the first chapter of the "Welding Manual Welding Methods and Equipment Volume 1" compiled by the Welding Society of the Chinese Mechanical Engineering Society, arc welding is used when welding metals with high melting point and low melting point

Electrode arc welding and submerged arc welding are mostly used for metals with low melting points and no high-quality weld requirements; Gas shielded welding is mostly used for metals with high melting points or high weld quality.

2. According to the first chapter of the "Welding Manual Welding Methods and Equipment Volume 1" compiled by the Welding Society of the Chinese Mechanical Engineering Society, argon electric joint welding is suitable for metals with low melting points and high quality requirements for welds.

Because argon arc welding uses argon as a shielding gas, but at the same time, the heat emitted by arc welding of contrast electrodes is higher, so it is not easy to weld metals with low melting points, and it is easy to cause deformation of metal thermal stress; Therefore, the use of argon arc welding as the base, and then the use of electrode arc welding cover, can ensure the welding quality at the same time, will not cause the deformation of the weldment.

3. It has nothing to do with DN.

Argon arc welding is mainly embodied in gas protection, without coating, there will be no slag inclusion or something, generally in addition to the welding gun has gas protection, such as the outside welding pipeline needs to be filled with argon protection, so the welding will not be oxidized, the welding quality will be better, I don't know whether the answer is satisfactory.

1)*** As long as the appropriate welding wire, welding process parameters and good gas protection are selected, the root can get good penetration, and the permeability is uniform, and the surface is smooth and neat. There are no defects such as welding nodules, lack of penetration and depression that are easy to occur during arc welding of general electrodes. (2) High efficiency In the first layer welding of pipelines, manual argon arc welding is continuous arc welding.

The electrode arc welding is broken arc welding, so manual argon arc welding can improve the efficiency by 2 4 times. Since there is no need to clean the slag and repair the weld bead, the speed is faster. In the second layer of arc welding cover, smooth and neat argon arc welding on the bottom layer is very conducive to arc welding cover, which can ensure good fusion between layers, especially in the welding of small diameter pipes, the efficiency is more significant.

Why do you use argon arc welding, is it because the molding is good?

The big pipe, which can be lowered by people, can be welded casually, and it can be polished and repaired by people anyway.

Argon arc welding priming, electrode arc welding CO2 cover surface, referred to as argon electric welding.

It is to pass argon shielding gas around the arc welding to isolate the air from the welding area and prevent oxidation in the welding area.

Argon arc welding technology is based on the principle of ordinary arc welding, the use of argon to protect the metal welding consumables, through high current to make the welding consumables melt into a liquid state on the welded substrate to form a molten pool, so that the welded metal and the welding consumables to achieve metallurgical combination of a welding technology, because of the continuous delivery of argon in the high temperature melt welding, so that the welding consumables can not contact with the oxygen in the air, thereby preventing the oxidation of the welding consumables, so that stainless steel, iron hardware metals can be welded.

Extended information: The working principle of argon arc welding in the main circuit, auxiliary power supply, drive circuit, protection circuit, etc. is the same as that of hand arc welding. I will not go into more detail here, but focus on the unique control function and arc starting circuit function of argon arc welding machine.

The reason why TIG welding can be so widely used is mainly because of the following advantages.

1. Argon protection can isolate the adverse effects of oxygen, nitrogen, hydrogen and other gases in the air on the arc and molten pool, reduce the burning loss of alloying elements, and obtain dense, spatter-free and high-quality welded joints;

2. The arc of argon arc welding is stable, the heat is concentrated, the arc column temperature is high, the welding production efficiency is high, the heat affected zone is narrow, and the weldment stress, deformation and crack tendency of the weldment are small;

3. Argon arc welding is open arc welding, which is convenient for operation and observation;

4. The electrode loss is small, the arc length is easy to maintain, and there is no flux and coating layer during welding, so it is easy to realize mechanization and automation;

5. TIG welding can weld almost all metals, especially some refractory metals and easily oxidized metals, such as magnesium, titanium, molybdenum, zirconium, aluminum, etc. and their alloys;

6. It is not limited by the position of the weldment, and can be welded in all positions.

The first time of argon arc welding and root welding, uniform and meticulous, leak-proof.

The electric welding is carried out for the second time, and the full welding can be done.

The process requirements are the same as the process requirements of argon arc welding and electric welding, and there are no slag inclusion pore cracks.

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Argon welding is argon arc welding as the bottom and the handle is welded to the cover. If you study in a formal training school, it only takes two months to master, and after the completion of the course, you will arrange certification and employment issues, and your salary will also be increased in the future, because you can't work without a certificate now.

What is argon combined welding of pipelines? Why use argon and electric welding? Novice dry pipes must be understood.

How does argon welding work? The master's salary is not much 400 a day, how much do you think this welding technology is appropriate?

, all over, arc. Fruit workers.

It is more suitable for the gas parts to be welded, the anti-welding can be welded, and the high slag should be all over the argon, and the first piece of damage should be used to shoot welding. With the ready-to-be, the line welding arc with the clamp crack X-grain welding electric base is a fine and equal to the working hours. There is no such thing as uniformity, adding, seeking to increase the welding of the full argon to find the hole leakage. , ask for a mouth.

Argon welding priming, arc filling and covering.

It is usually used for occasions where there is single-sided welding and double-sided forming, such as pipe welding.

Argon arc welding is used to make the base, and single-sided welding is double-sided forming, but the efficiency is low;

Therefore, the filling and cover surface are welded by other methods, which refers to the arc welding of the electrode, in fact, other methods can also be used, such as MAG is also very useful.

It is the construction and acceptance specification of field equipment and industrial pipeline welding engineering.

The specific specifications are as follows:

1.The design code requires that the heating branch pipe shall not be less than DN20.

2.Thermal insulation routine water supply: anti-condensation insulation, hot water: insulation, fire protection: not insulation, chilled water: even valves need to be insulated, cooling water: according to the design requirements, not required can not be done. Generally, the pipes in the ceiling need to be insulated.

Water supply: dark application to prevent condensation and heat preservation; The entrance hall, bedroom and living room must be insulated to prevent condensation. Drainage: dark compress for anti-condensation insulation; It is necessary to do the reverse bend on the toilet in the open toilet. In addition to fire fighting, spraying pipelines and pipelines are insulated.

3.Galvanized steel pipe connection method: "DN100 wire connection, > DN100 can be welded (anti-corrosion), flange welding (need to be secondary galvanized), a small amount of wire flange connection.

4.The distance between the pipe skin and the wall is 25-50mm.

5.When the heating main pipe is connected to the riser, when the straight pipe section of the riser is < 15m, two 90s are used. Elbow, when the straight pipe section "15m, use 3 90. Elbow.

6.During construction, the drainage pipe should be high rather than low, and the floor drain should be low rather than high.

7.Elevation regulations: indoor pipes are generally in the pipe, outdoor pipeline drainage is the bottom of the pipe, and water supply is the top of the pipe.

8.The radiator should be coaxial with the window.

9.Gate valve: switch action, resistance coefficient; Globe valve: adjust the switch function, resistance coefficient 19.

10.Compensators are divided into: natural compensation, square expansion, elbow, corrugated compensation, sleeve compensation, spherical expansion, and keratin expansion.

11.Gas Collecting Tank: The end of the main pipe, the diameter of which is 4-6 times the diameter of the end pipe. Expansion tank: stabilizing, exhausting, holding expansion water, signaling effect. Pneumatic tank: stabilized, vented.

Nothing special is required. Generally, argon arc welding is used for root welding, and full argon arc welding is used for pipes with sizes of 2" and below 2"; Pipes larger than 2" can be TIG welded for priming, and electrode arc welding for filling and covering. TIG welding wire:

H10mnsi, H08mn2si, ER50-6 optional, diameter 2mm is sufficient. According to the requirements level of the pipeline, the welding rod can be J422, J426, J507. The current standard GB T20801-2006 Pressure Pipeline Code - Industrial Pipeline and SH3501 "Code for Construction and Acceptance of Petrochemical Toxic and Combustible Medium Pipeline Engineering".

Standard: I'll send you an email.

I don't know if that's what you need.

The welding specifications for polyethylene pipes are Gas TSG 2002-2006 ISO 11414 DVS2207

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Argon joint welding is argon arc welding to lay the base, and the electrode welding fills the cover surface.

Then there are two welding methods, argon arc welding and electrode welding.