CN105880805A - Argon arc welding process - Google Patents

Abstract

The invention discloses an argon arc welding process. The process comprises the following procedures that (1) equipment is inspected before welding; (2) welding materials are prepared; (3) as for the weldment requirements, (3.1) the argon arc welding operation should be carried out indoors, (3.2) in the welding process, a welder should operate strictly according to the process specification and keep an eye on a molten bath to ensure penetration and one-side welding with double face formation, a pipe with the wall thickness being 3-6 mm is welded in a two-layer mode, when welding is interrupted, a weld should be overlaid on an original weld by 6-8 mm in the next time of welding, and (3.3) after the weld is welded, the welder should inspect the appearance quality of the weld, repair and grind surface defects and stamp a welder steel seal as required; and (4) the weld surface quality is inspected, specifically, (4.1) the weld appearance size should meet the requirements of a design drawing and process files, the weld is not lower than the surface of base metal, and the weld and the base metal should be in smooth transition, (4.2) no crack, slag inclusion, crater or pore exists in the surface of the weld and the surface of a heat affected zone of the weld, and (4.3) the depth of undercuts of the pipe weld is no more than 0.5 mm, namely the total length of the undercuts on the two sides of the pipe weld.

Description

A kind of argon arc welding technique

Technical field

The present invention relates to a kind of argon arc welding technique.

Background technology

Existing argon arc welding technique there is also certain empirical and technology in the adjustment of the aspect such as processing step and device parameter Property, for the operator newly started with, in addition it is also necessary to carrying out substantial amounts of exercise could grasp operation skill, produce quality preferable Product.

Summary of the invention

In order to realize the purpose of the present invention, the present invention provides a kind of easy to operate, quick, argon arc welding technique of easy left-hand seat.

For solving above-mentioned technical problem, the present invention adopts the following technical scheme that

A kind of argon arc welding technique, including following operation:

1), check before the weldering of equipment

A. inspection argon cylinder valve is with or without leaking gas and malfunctioning, and airway is the most unimpeded, and the instrument and meter such as current voltmeter, effusion meter is the most just Often etc.；

B. connect welding permutator, mix up welding current, down slope time gas lag time, choose length permutator； Numerical value needed for regulation argon flow amount；

D. tungsten bar is worn into required form, regulate tungsten electrode and stretch out nozzle length (3～about 6mm)；

B., before assembling, groove and both sides of edges thereof respectively should be removed totally not less than foreign material such as the greasy dirt in the range of 10mm, rust, until Expose metallic luster；

C. when weldment is with argon arc welding tack welding, it is advisable melting root face: when caliber is less than or equal to φ 42mm, can be at tack welding one, position Position to the left on pipe top；Pipe for external diameter φ 42～60mm can symmetrical position at two, and external diameter is more than 60mm Pipe can uniformly position at three, tack welding length 10～20mm, tack welding should ensure that quality, if any incomplete fusion, lack of penetration, The defects such as pore, should reorientate weldering after removing；

2), welding material

A. select the suitable welding wire trade mark and specification according to different materials, before weldering, should thoroughly remove the greasy dirt of welding wire surface；

The most under normal circumstances, argon flow amount is 6～10L/min, and when argon flow amount is the least, electric arc can not obtain due protection；The biggest Time, electric arc can be caused unstable；

C. the tungsten bar diameter of argon tungsten-arc welding can select according to the thickness of weldment, and weldment wall thickness is 3～6mm, tungsten bar diameter 2.5～4mm, The length that tungsten bar stretches out nozzle is the shortest according to weldment, generally 4～6mm；

3), weldment requirement

3.1) argon arc welding welding work should be carried out in indoor, and has suitable draught exclusion device；

3.2) in welding process, welder should strictly press technological specification operation, notes observing molten bath, it is ensured that penetration and one side welding with back formation； The pipe of wall thickness 3～6mm uses two-layer welding, and when welding is interrupted, again playing weldering should overlapping with former weld seam 6～8mm；

3.3), after weld seam is soldered, welder should check weld appearance quality, thinning surface defect, and stamps welder's steel seal by regulation；

4), face of weld quality examination

4.1) weld appearance size should meet the regulation of detail of design and technical papers, and weld bead height is not less than mother metal surface, and weld seam is with female Rounding off answered by material；

4.2) weld seam and surface, heat affected area flawless, slag inclusion, arc crater and pore；

4.3) the pipe weld undercut degree of depth is less than 0.5mm, pipe weld both sides undercut total length.

The present invention is simple to operate, low to operator's skill requirement, and product quality is high.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

A kind of argon arc welding technique, including following operation:

1), check before the weldering of equipment

A. inspection argon cylinder valve is with or without leaking gas and malfunctioning, and airway is the most unimpeded, and the instrument and meter such as current voltmeter, effusion meter is the most just Often etc.；

B. connect welding permutator, mix up welding current, down slope time gas lag time, choose length permutator； Numerical value needed for regulation argon flow amount；

D. tungsten bar is worn into required form, regulate tungsten electrode and stretch out nozzle length (3～about 6mm)；

B., before assembling, groove and both sides of edges thereof respectively should be removed totally not less than foreign material such as the greasy dirt in the range of 10mm, rust, until Expose metallic luster；

C. when weldment is with argon arc welding tack welding, it is advisable melting root face: when caliber is less than or equal to φ 42mm, can be at tack welding one, position Position to the left on pipe top；Pipe for external diameter φ 42～60mm can symmetrical position at two, and external diameter is more than 60mm Pipe can uniformly position at three, tack welding length 10～20mm, tack welding should ensure that quality, if any incomplete fusion, lack of penetration, The defects such as pore, should reorientate weldering after removing；

2), welding material

A. select the suitable welding wire trade mark and specification according to different materials, before weldering, should thoroughly remove the greasy dirt of welding wire surface；

The most under normal circumstances, argon flow amount is 6～10L/min, and when argon flow amount is the least, electric arc can not obtain due protection；The biggest Time, electric arc can be caused unstable；

C. the tungsten bar diameter of argon tungsten-arc welding can select according to the thickness of weldment, and weldment wall thickness is 3～6mm, tungsten bar diameter 2.5～4mm, The length that tungsten bar stretches out nozzle is the shortest according to weldment, generally 4～6mm；

3), weldment requirement

3.1) argon arc welding welding work should be carried out in indoor, and has suitable draught exclusion device；

3.2) in welding process, welder should strictly press technological specification operation, notes observing molten bath, it is ensured that penetration and one side welding with back formation； The pipe of wall thickness 3～6mm uses two-layer welding, and when welding is interrupted, again playing weldering should overlapping with former weld seam 6～8mm；

3.3), after weld seam is soldered, welder should check weld appearance quality, thinning surface defect, and stamps welder's steel seal by regulation；

4), face of weld quality examination

4.1) weld appearance size should meet the regulation of detail of design and technical papers, and weld bead height is not less than mother metal surface, and weld seam is with female Rounding off answered by material；

4.2) weld seam and surface, heat affected area flawless, slag inclusion, arc crater and pore；

4.3) the pipe weld undercut degree of depth is less than 0.5mm, pipe weld both sides undercut total length.

Claims (1)

1. an argon arc welding technique, is characterized in that: include following operation:

1), check before the weldering of equipment

A. inspection argon cylinder valve is with or without leaking gas and malfunctioning, and airway is the most unimpeded, and the instrument and meter such as current voltmeter, effusion meter is the most just Often etc.；

B. connect welding permutator, mix up welding current, down slope time gas lag time, choose length permutator； Numerical value needed for regulation argon flow amount；

D. tungsten bar is worn into required form, regulate tungsten electrode and stretch out nozzle length (3～about 6mm)；

B., before assembling, groove and both sides of edges thereof respectively should be removed totally not less than foreign material such as the greasy dirt in the range of 10mm, rust, until Expose metallic luster；

C. when weldment is with argon arc welding tack welding, it is advisable melting root face: when caliber is less than or equal to φ 42mm, can be at tack welding one, position Position to the left on pipe top；Pipe for external diameter φ 42～60mm can symmetrical position at two, and external diameter is more than 60mm Pipe can uniformly position at three, tack welding length 10～20mm, tack welding should ensure that quality, if any incomplete fusion, lack of penetration, The defects such as pore, should reorientate weldering after removing；

2), welding material

A. select the suitable welding wire trade mark and specification according to different materials, before weldering, should thoroughly remove the greasy dirt of welding wire surface；

The most under normal circumstances, argon flow amount is 6～10L/min, and when argon flow amount is the least, electric arc can not obtain due protection；The biggest Time, electric arc can be caused unstable；

C. the tungsten bar diameter of argon tungsten-arc welding can select according to the thickness of weldment, and weldment wall thickness is 3～6mm, tungsten bar diameter 2.5～4mm, The length that tungsten bar stretches out nozzle is the shortest according to weldment, generally 4～6mm；

3), weldment requirement

3.1) argon arc welding welding work should be carried out in indoor, and has suitable draught exclusion device；

3.2) in welding process, welder should strictly press technological specification operation, notes observing molten bath, it is ensured that penetration and one side welding with back formation； The pipe of wall thickness 3～6mm uses two-layer welding, and when welding is interrupted, again playing weldering should overlapping with former weld seam 6～8mm；

3.3), after weld seam is soldered, welder should check weld appearance quality, thinning surface defect, and stamps welder's steel seal by regulation；

4), face of weld quality examination

4.1) weld appearance size should meet the regulation of detail of design and technical papers, and weld bead height is not less than mother metal surface, and weld seam is with female Rounding off answered by material；

4.2) weld seam and surface, heat affected area flawless, slag inclusion, arc crater and pore；

4.3) the pipe weld undercut degree of depth is less than 0.5mm, pipe weld both sides undercut total length.