CN105750704A - Aluminum and aluminum alloy argon arc welding technique - Google Patents

Abstract

The invention discloses an aluminum and aluminum alloy argon arc welding technique. The aluminum and aluminum alloy argon arc welding technique includes the following steps: 1) device checking before welding; 2) a welding material; 3) a requirement of a welding piece, 3.1) argon arc welding should be performed indoor; 3.2) during welding, a welder should operate strictly according to a technique specification, observes a molten pool, and ensures penetration and single welding and dual side-forming; a tube with the wall thickness of 3-6 mm adopts dual-layer welding; when welding is interrupted, the current welding position should overlap an original weld joint 6-8 mm during re-welding; 3.3) after the weld joint is welded, the welder should check the appearance and the quality of the weld joint, repair and grind surface defects, and brand a steel seal of the welder; and 4) checking of the quality of a surface of the weld joint, 4.1) the size of the appearance of the weld joint should meet stipulations of a design drawing and a technique file, the height of the weld joint is not lower than a surface of base material, and the weld joint and the base material should be in round transition; 4.2) surfaces of the weld joint and a heat affected zone thereof should have no cracks, slag inclusion, craters, and gas holes; and 4.3) the depth of an undercut of the weld joint of the tube is not greater than 0.5 mm, and the total length of the undercuts at two sides of the weld joint of the tube.

Description

A kind of aluminum and aluminium alloy argon arc welding technique

Technical field

The present invention relates to a kind of aluminum and aluminium alloy argon arc welding technique.

Background technology

Existing aluminum and the adjustment in processing step and device parameter etc. of the aluminium alloy argon arc welding technique there is also certain empirical and technical, for the operator newly started with, also need to carry out substantial amounts of exercise and could grasp operation skill, produce the good product of quality.

Summary of the invention

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

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

A kind of aluminum and aluminium alloy argon arc welding technique, including following operation:

1), check before the weldering of equipment

A. checking that argon cylinder valve is with or without leaking gas and malfunctioning, whether airway is unimpeded, and whether the instrument and meter such as current voltmeter, effusion meter is normal；

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

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

B., before assembling, groove and both sides of edges thereof are respectively not less than the foreign material such as the greasy dirt within the scope of 10mm, rust and should remove totally, until exposing metallic luster；

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

B. under normal circumstances, argon flow amount is 6 ~ 10L/min, and when argon flow amount is too little, electric arc can not obtain due protection；Time too big, 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, and the length that tungsten bar stretches out nozzle is short as far as possible according to weldment, is generally 4 ~ 6mm；

3), weldment requirement

3.1) argon arc welding welding work should carry 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 adopts two-layer welding, and when welding is interrupted, again playing weldering should 6 ~ 8mm overlapping with former weld seam；

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 and mother metal answer rounding off；

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, and operator's skill requirement is low, and product quality is high.

Detailed description of the invention

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

A kind of aluminum and aluminium alloy argon arc welding technique, including following operation:

1), check before the weldering of equipment

A. checking that argon cylinder valve is with or without leaking gas and malfunctioning, whether airway is unimpeded, and whether the instrument and meter such as current voltmeter, effusion meter is normal；

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

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

B., before assembling, groove and both sides of edges thereof are respectively not less than the foreign material such as the greasy dirt within the scope of 10mm, rust and should remove totally, until exposing metallic luster；

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

B. under normal circumstances, argon flow amount is 6 ~ 10L/min, and when argon flow amount is too little, electric arc can not obtain due protection；Time too big, 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, and the length that tungsten bar stretches out nozzle is short as far as possible according to weldment, is generally 4 ~ 6mm；

3), weldment requirement

3.1) argon arc welding welding work should carry 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 adopts two-layer welding, and when welding is interrupted, again playing weldering should 6 ~ 8mm overlapping with former weld seam；

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 and mother metal answer rounding off；

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. aluminum and an aluminium alloy argon arc welding technique, is characterized in that: include following operation:

1), check before the weldering of equipment

A. checking that argon cylinder valve is with or without leaking gas and malfunctioning, whether airway is unimpeded, and whether the instrument and meter such as current voltmeter, effusion meter is normal；

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

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

B., before assembling, groove and both sides of edges thereof are respectively not less than the foreign material such as the greasy dirt within the scope of 10mm, rust and should remove totally, until exposing metallic luster；

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

B. under normal circumstances, argon flow amount is 6 ~ 10L/min, and when argon flow amount is too little, electric arc can not obtain due protection；Time too big, 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, and the length that tungsten bar stretches out nozzle is short as far as possible according to weldment, is generally 4 ~ 6mm；

3), weldment requirement

3.1) argon arc welding welding work should carry 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 adopts two-layer welding, and when welding is interrupted, again playing weldering should 6 ~ 8mm overlapping with former weld seam；

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 and mother metal answer rounding off；

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.