CN102837115A - Seamless welding method for aluminum and aluminum alloy or pipeline - Google Patents

Seamless welding method for aluminum and aluminum alloy or pipeline Download PDF

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Publication number
CN102837115A
CN102837115A CN2012103748072A CN201210374807A CN102837115A CN 102837115 A CN102837115 A CN 102837115A CN 2012103748072 A CN2012103748072 A CN 2012103748072A CN 201210374807 A CN201210374807 A CN 201210374807A CN 102837115 A CN102837115 A CN 102837115A
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welding
weldments
aluminium
pipeline
weldment
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夏节文
陈家林
苏玉贤
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China National Chemical Engineering Third Construction Co Ltd
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China National Chemical Engineering Third Construction Co Ltd
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Priority to CN2012103748072A priority Critical patent/CN102837115A/en
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Abstract

The invention relates to a method for an aluminum and aluminum alloy or pipeline, in particular to a seamless welding method for the aluminum or aluminum alloy or pipeline. The seamless welding method comprises the following steps of: forming surfaces to be welded which are parallel to each other by end faces of two weldments to be welded; respectively chamfering on inner sides of two surfaces to be welded and thus forming small V-shaped chamfers on the inner sides of two weldments after the two weldments are abutted, wherein the distance between the tips of the small V-shaped chamfers and the inner walls of the weldments is 0.5-1.0mm and an opening angle is 40-50 degrees; respectively carrying out ungrease treatment on inner and outer sides and the small V-shaped chamfers of the two weldments and carrying out ungrease treatment on welding wire; seamlessly assembling on the two weldments; carrying out positioning welding on the outer sides of the weldments; finishing the welding of a root pass by adding a self-melting method without adding the welding wire or adding small amount of welding wire, wherein during welding, the flow of argon gas is 5-20L/min, the current is 100-110A, the voltage is 15-18V and the speed is 7-9cm/min; and adding the welding wire to finish the welding of a covering layer.

Description

The no gap welding method of aluminium and aluminium alloy equipment or pipeline
Technical field
The present invention relates to aluminium and aluminium alloy welding field, particularly relate to a kind of no gap welding method that is used for aluminium and aluminium alloy equipment or pipeline.
Background technology
Because aluminium and aluminium alloy have good corrosion resistance and do not have the iron pollution material; Has ultralow temperature serviceability (even still not existing fragility to change) at-269 ℃; Have characteristics such as relative weight is the lightest with its manufacturing equipment and pipeline, so extensive use in the equipment of industries such as petrochemical industry, metallurgy, electric power, boats and ships and pipeline engineering.For example: the equipment of present most of air-separating plants and pipeline mainly adopt aluminum alloy materials; The corrosivity material bunkerage of many chemical plant installations has also adopted aluminium and aluminum alloy materials in a large number.Wherein the field Welding of aluminium and aluminium alloy equipment and pipeline has become vital construction link in these engineerings.
The welding method of aluminium and aluminium alloy equipment and pipeline mainly is GTAW and semi-automatic metal argon arc welding, and the root backing welding of weld seam adopts the welding procedure of bevel, preset clearance usually.Though can realize one side welding with back formation, but still have some insoluble problems, like: a large amount of welding pores that occur, incomplete fusion, defective such as lack of penetration, the welding first-time qualification rate is very low, only reaches about 70%.Because at high temperature fusing point is low, flowability is strong for the welding deposited metal of aluminium and aluminium alloy, root pass is shaped difficult, and group is prone to cause defectives such as generation is subsided, overlap to excesssive gap; Group is to too small lack of penetration, the incomplete fusion defective of generation that is prone to again in gap.Because aluminium has high thermal and specific heat capacity, makes that the welding incomplete fusion problem of large scale equipment and pipeline is more outstanding.The welding pool metal of aluminium and aluminium alloy does not have during by solid-state liquefy tangible color and luster to change, and makes welder be not easily distinguishable molten bath and mother metal, and the probability that above-mentioned weld defect occurs is bigger.In the almag equipment and pipeline in air-separating plant; For solving above-mentioned problems of welded quality; Usually be employed in combined welding method that back of weld adds the cushions to realize one side welding with back formation; But the problem that exists is to have reduced sectional area in the pipeline, has increased the resistance to the pipeline fluid medium, and has increased engineering cost and welding service working time (operation that has increased gasket material, groove gap, liner processing and installed).Whether back of weld allows the welding that adds the cushions, and also must obtain the agreement of designing unit.
Summary of the invention
The technical problem that the present invention will solve provides a kind of aluminium simple to operate and the no gap welding method of aluminium alloy equipment or pipeline, does not use liner in the welding process, has reduced the welding job amount, can improve the once qualification rate of welding simultaneously.
During smaller or equal to 4 millimeters weldment, the no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline comprises the following steps: at throat thickness
1), two weldments end face that need weld forms to be welded that is parallel to each other; Equal chamfering on two to be welded the inner side edge; Thereby form the little chamfering of V-arrangement in the inboard of two weldments two weldment butt joint backs; The distance between two tips weldment inwall 0.5 ~ 1.0mm of the little chamfering of V-arrangement, the opening angle of the little chamfering of V-arrangement is 40 ~ 50 °;
2), the little chamfering of interior lateral surface, V-arrangement of two weldments is all carried out ungrease treatment, welding wire is carried out ungrease treatment;
3), not have dwell set right for two weldments;
4), position weldering in the weldment outside;
5), use the argon tungsten-arc welding mode, adopt not add welding wire from molten method or add the welding that a small amount of welding wire is accomplished root pass, argon flow amount is 15 ~ 20L/min during welding, welding current is 100 ~ 110A, weldingvoltage is 15 ~ 18V, speed of welding is 7 ~ 9cm/min;
6), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion capping layer.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline, in wherein said step 5) and the step 6), welding point with receive the 30-40mm that all extends of arc place, do not add welding wire during welding point.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline, after accomplishing the root pass welding, before the welding of beginning capping layer, the time interval of the two is no more than 15min.
During greater than 4 millimeters weldment, the no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline comprises the following steps: at throat thickness
1), the outside of two weldments forms V-butt, forms the little chamfering of V-arrangement in the inboard of two weldments, the root of V-butt contacts with the tip of the little chamfering of V-arrangement, the distance between two tips weldment inwall 1 ~ 2mm of the little chamfering of V-arrangement, the opening angle of the little chamfering of V-arrangement is 10 ~ 20 °;
2), the interior lateral surface of two weldments and V-butt, the little chamfering of V-arrangement are all carried out ungrease treatment, welding wire is carried out ungrease treatment;
3), not have dwell set right for two weldments;
4), in the weldment groove, position weldering;
5), use the argon tungsten-arc welding mode, evenly add a small amount of welding wire and accomplish the root pass welding, argon flow amount is 15 ~ 25L/min during welding, welding current is 110 ~ 125A, weldingvoltage is 15 ~ 18V, speed of welding is 8 ~ 10cm/min;
6), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion packed layer;
7), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion capping layer.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline, when welding manner was downhand welding, vertical position welding or overhead welding, the opening angle of V-butt was 50 ~ 60 °; When welding manner was horizontal position welding, the opening angle of V-butt was 50 ~ 70 °, and the angle that wherein constitutes the chamfering on the top weldment of V-butt is 40 ~ 50 °, and the angle that constitutes the chamfering on the bottom weldment of V-butt is 10 ~ 20 °.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline, in wherein said step 5), step 6) and the step 7), welding point with receive the 30-40mm that all extends of arc place, do not add welding wire during welding point.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline is after accomplishing the root pass welding, before the welding of beginning packed layer; The time interval of the two is no more than 15min; After accomplishing the packed layer welding, before the welding of beginning capping layer, the time interval of the two is no more than 15min.
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline when welding manner is horizontal position welding, is taked from top to bottom or the arrow path welding manner of alternatively up and down.
The no gap welding method difference from prior art of aluminium of the present invention and aluminium alloy equipment or pipeline is that the present invention is not provided with the gap between two weldments; Given full play to the effect that mother metal sets off motlten metal; Make that root subsides, defective such as overlap, incomplete fusion, lack of penetration, crackle reduces greatly, through offer the little chamfering of V-arrangement in the inboard of weldment, helps the formation of root pass; And can effectively reduce air holes, can guarantee to weld first-time qualification rate all greater than 98%.Owing between weldment the gap is not set, reduced welding deposited metal amount simultaneously, reduced producing the probability of pore in the welding process, and reduced the welding job amount.
Below in conjunction with accompanying drawing the present invention is described further.
Description of drawings
Fig. 1 is the structural representation (weldment thickness is smaller or equal to 4 millimeters) of the no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline;
Fig. 2 is the structural representation (weldment thickness is greater than 4 millimeters, and welding manner is downhand welding, vertical position welding or overhead welding) of the no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline;
Fig. 3 is the structural representation (weldment thickness is greater than 4 millimeters, and welding manner is horizontal position welding) of the no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline.
The specific embodiment
The no gap welding method of aluminium of the present invention and aluminium alloy equipment or pipeline is given full play to the effect that mother metal and bevel for welding set off motlten metal, to the wall thickness of the weldment situation smaller or equal to 4mm, takes square groove, does not stay the mode in counterpart gap to weld; To the wall thickness of weldment situation, take groove, do not stay the mode of counterpart gap and root face to weld greater than 4mm.Through in little chamfering of weldment inboard processing V-arrangement and the method for improving welding procedure, both made mother metal or groove tip block the excessive formation overlap that prevents to drop of motlten metal; Mother metal or groove tip are melted and fusion each other fully, realize that root is shaped; Can go out the foreign material in the molten bath clearly simultaneously, reduce defectives such as pore, root incomplete fusion, crackle and produce.
Concrete technical process is following:
1), adopt square groove, do not stay the welding method in gap for the equipment and the pipeline butt weld of wall thickness smaller or equal to 4mm:
(1) weldment end square groove with disk alloy blade, the first-class instrument cutting processing of alloy reamer weldment end face, guarantees that the weldment both ends of the surface are parallel.As shown in Figure 1, form the little chamfering 2 of V-arrangement in two weldments, 1 butt joint back in the inboard (back side) of two weldments, wherein the distance value d1 of the distance between two tips weldment inwall of the little chamfering of V-arrangement is 0.5 ~ 1.0mm, the opening angle α 1 of the little chamfering of V-arrangement is 40 ~ 50 °.
(2) the interior lateral surface of two weldments and to be welded are all carried out ungrease treatment, welding wire is carried out ungrease treatment.Clean out machined burrs and oxide-film on to be welded of the weldment with stainless steel wire brush, stainless steel cleaning ball, expose metallic luster.The weldment that cleaning finishes with degreasing in time organize to, weld, welding wire will in time use, otherwise should clear up again and degreasing.
(3) as shown in Figure 1, it is right that two weldments 1 do not have dwell set.Adopt instrument calibration ellipsometer circularity such as wooden mallet and local misalignment overproof, make the inwall unfitness of butt joint meet the standard criterion requirement, to reach better welding effect.
(4) position weldering in the weldment outside.
(5) use the argon tungsten-arc welding mode; Adopt and do not add the certainly molten method of welding wire or add the welding that a small amount of welding wire is accomplished root pass; Argon flow amount is 15 ~ 20L/min during welding, and welding current is 100 ~ 110A, and weldingvoltage is 15 ~ 18V; Speed of welding is 7 ~ 9cm/min, and selecting diameter for use is the welding wire of φ 2.5~3.0mm.Welding gun stops a moment facing to the no dwell set of weldment to the slot line place during starting the arc; This moment, welding gun was not done any swing; Behind the molten bath to be formed along the weldment group to the slot line welding gun that moves forward equably; Molten pool metal is permeated in organizing the slit equably, fuse group fully to slot line, it is smooth bright and clean to form the root pass surfaces externally and internally.When weld at the overhead welding position, concentrate the electric arc heat, increase electric arc thrust through the distance that reduces tungsten electrode and mother metal molten bath; Evenly add a small amount of welding wire; Suitably strengthen gas flow; Increase measures such as fusion penetration, minimizing weld width, make the root of weld evenly full.Other position welding also can be added a small amount of welding wire through the part and guarantee that the root pass outer surface flushes with mother metal or the slyness is recessed.
(6) use the argon tungsten-arc welding mode, add the sealing weld silk and accomplish the welding of capping layer.
When welding being, the welding point place of any position in step 5 or the step 6 with receive the 30 ~ 40mm that all will extend of arc place, do not add welding wire during welding point.Evenly move to during the starting the arc and receive the arc place, keep beginning During normal welding after the normal welding temperature.Must be after continued to move 30 ~ 40mm when receiving arc at former section start, the blow-out that decays behind a small amount of filling of the adding metal avoids occurring receiving the lack of penetration or incomplete fusion and the generation receipts burst check line at arc place.
After accomplishing the root pass welding, before the welding of beginning capping layer, the time interval of the two is no more than 15min, its objective is to prevent root pass surface and the oxidation of air Long contact time, produces incomplete fusion and more pore when avoiding the welding of capping layer.When root pass was longer, the method that can take many people symmetry to weld simultaneously to shorten root pass weld interval, guaranteed that the middle time of staying of root pass and final pass is no more than 15min, and the while also reduces welding stress and distortion.
In welding process, as accidentally welding wire being touched electrode or electrode touches workpiece, blow-out is immediately cleaned out the place of oxidation blackout, again welding.In the welding process, the tungsten electrode front end occur to pollute (the tungsten electrode surface is brown, yellow green or blueness and shows that oxidation is serious) or when irregularly shaped, should in time revise or change tungsten electrode.When the tungsten inclusion phenomenon appears in weld seam, should be with proceeding welding after tungsten electrode, welding wire, the molten bath processing totally.
Embodiment 1:
(1) mother metal: almag pipe 5083, specification φ 219 * 3mm.
(2) welding material: welding wire ER5183, specification φ 2.5mm.
(3) the weldment group is right: horizontal fixed mouth group is right, square groove, does not stay the gap, the distance between two tips weldment inwall of the little chamfering of V-arrangement of the inboard of two weldments, and 0.5mm, the opening angle of the little chamfering of V-arrangement are 40 °.
(4) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 15L/min; Welding current 100A; Weldingvoltage 18V; Speed of welding 8.0cm/min.
(5) add the sealing weld silk and accomplish the welding of capping layer.
(6) weld inspection:
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the II level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 295MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 6.6 times of mother metal thickness, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
Embodiment 2:
(1) mother metal: almag pipe 5083, specification φ 168.3 * 4mm.
(2) welding material: welding wire ER5183, specification φ 3.0mm.
(3) the weldment group is right: vertical fixing mouth group is right, square groove, does not stay the gap, the distance between two tips weldment inwall 0.7mm of the little chamfering of V-arrangement of the inboard of two weldments, and the opening angle of the little chamfering of V-arrangement is 50 °.
(4) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 15L/min; Welding current 105A; Weldingvoltage 15V; Speed of welding 9.0cm/min.
(5) add the sealing weld silk and accomplish the welding of capping layer.
(6) weld inspection.
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration.
2. X-ray procedure: the egative film rating is the I level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 285MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 6.6 times of mother metal thickness, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
Embodiment 3:
(1) mother metal: aluminium-alloy pipe 5052, specification φ 208 * 4mm.
(2) welding material: welding wire R5356, specification φ 3.0mm.
(3) the weldment group is right: 450 fixing port groups are right, square groove, do not stay the gap, the distance between two tips weldment inwall 1.0mm of the little chamfering of V-arrangement of the inboard of two weldments, and the opening angle of the little chamfering of V-arrangement is 48 °.
(4) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 20L/min; Welding current 110A; Weldingvoltage 18V; Speed of welding 7.0cm/min.
(5) add the sealing weld silk and accomplish the welding of capping layer.
(6) weld inspection.
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the II level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 193MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 6.6 times of mother metal thickness, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
2), adopt bevel, do not stay the welding method in gap for the equipment and the pipeline butt weld of wall thickness greater than 4mm:
(1) adopts tool processes weldment grooves such as lathe or abrasive machine; Like Fig. 2, shown in Figure 3; The outside at two weldments 3 forms V-butt 4, forms the little chamfering 5 of V-arrangement in the inboard of two weldments, and the root of V-butt 4 contacts with the tip of the little chamfering 5 of V-arrangement; The distance value d2 of the distance between two tips weldment inwall of the little chamfering 5 of V-arrangement is 1 ~ 2mm, and the opening angle α 2 of the little chamfering 5 of V-arrangement is 10 ~ 20 °.Reduce 10~20 ° when wherein V-butt 4 angles are than traditional welding method, do not stay root face.When welding manner was downhand welding, vertical position welding or overhead welding, the opening angle β 1 of V-butt 4 was 50 ~ 60 °; As shown in Figure 3; When welding manner is horizontal position welding; The opening angle β 2 of V-butt 4 is 50 ~ 70 °, and the angle beta 3 that wherein constitutes the chamfering on the top weldment of V-butt is 40 ~ 50 °, and the angle beta 4 that constitutes the chamfering on the bottom weldment of V-butt is 10 ~ 20 °.
(2) the interior lateral surface of two weldments and V-butt, the little chamfering of V-arrangement are all carried out ungrease treatment, welding wire is carried out ungrease treatment.Clean out machined burrs and oxide-film on to be welded of the weldment with stainless steel wire brush, stainless steel cleaning ball, expose metallic luster.The weldment that cleaning finishes with degreasing in time organize to, weld, welding wire will in time use, otherwise should clear up again and degreasing.
(3) it is right two weldment grooves not to be had dwell set.In order to prevent welding contraction distortion, (100~200mm) leave the gap of 2~3mm to the segment that can weld at last in preparation.Adopt instrument calibration ellipsometer circularity such as wooden mallet and local misalignment overproof, make the inwall unfitness of butt joint meet the standard criterion requirement, to reach better welding effect.
(4) in the weldment groove, position weldering.
(5) use the argon tungsten-arc welding mode, evenly add a small amount of welding wire and accomplish the root pass welding, argon flow amount is 15 ~ 25L/min during welding; Welding current is 110 ~ 125A; Weldingvoltage is 15 ~ 18V, and speed of welding is 8 ~ 10cm/min, and selecting diameter for use is the welding wire of φ 2.5 ~ 3.0mm.Welding gun stops a moment facing to the groove group of weldment to line place, no clearance gap crack during the starting the arc; This moment, welding gun was not done any swing; Behind the molten bath to be formed along the groove group to the slot line welding gun that moves forward equably, molten pool metal is permeated in to the slit equably, when the groove group fuses slot line fully to group; In the molten bath, add a small amount of welding wire equably, it is smooth bright and clean to form the root pass surfaces externally and internally.When weld at the overhead welding position, concentrate the electric arc heat, increase electric arc thrust through the distance that reduces tungsten electrode and mother metal molten bath; Suitably strengthen measures such as gas flow, make the root of weld evenly full.
(6) use the argon tungsten-arc welding mode, add the welding that welding wire is accomplished packed layer.
(7) use the argon tungsten-arc welding mode, add the welding that welding wire is accomplished the capping layer.
When welding being, the welding point place of any position in step 5 or step 6 or the step 7 with receive the 30 ~ 40mm that all will extend of arc place, do not add welding wire during welding point.Evenly move to during the starting the arc and receive the arc place, keep beginning During normal welding after the normal welding temperature.Must be after continued to move 30 ~ 40mm when receiving arc at former section start, the blow-out that decays behind a small amount of filling of the adding metal avoids occurring receiving the lack of penetration or incomplete fusion and the generation receipts burst check line at arc place.
After accomplishing the root pass welding, before the welding of beginning packed layer, the time interval of the two is no more than 15min, and after accomplishing the packed layer welding, before the welding of beginning capping layer, the time interval of the two is no more than 15min, and a weld seam will accomplish without any letup.Its objective is to prevent root pass surface or packed layer surface and the oxidation of air Long contact time, produce incomplete fusion and more pore when avoiding the welding of packed layer or capping layer.When root pass or packed layer are longer; The method that can take many people symmetry to weld simultaneously; To shorten weld interval, guarantee that the middle time of staying of root pass and packed layer, packed layer and final pass is no more than 15min, also reduce welding stress and distortion simultaneously.
In welding process, as accidentally welding wire being touched electrode or electrode touches workpiece, blow-out is immediately cleaned out the place of oxidation blackout, again welding.In the welding process, the tungsten electrode front end occur to pollute (the tungsten electrode surface is brown, yellow green or blueness and shows that oxidation is serious) or when irregularly shaped, should in time revise or change tungsten electrode.When the tungsten inclusion phenomenon appears in weld seam, should be with proceeding welding after tungsten electrode, welding wire, the molten bath processing totally.Filling, capping layer for the relatively thick weldment can adopt welding operation methods such as multi-pass welding, little swing, and per pass weldering meat is too not thick, too wide.When being horizontal position welding, can take from top to bottom or alternatively up and down arrow path soldering method, in case crack arrest line and pore for welding manner.
Embodiment 4:
(1) mother metal: almag plate 5083, specification δ=10mm.
(2) welding material: welding wire ER5183, specification φ 3.0mm.
(3) groove processing: adopt abrasive machine to dock double V-groove processing; The angle of the chamfering on the top weldment of vertical fixing (horizontal position welding mode) V-butt is 40 °; The angle of the chamfering on the bottom weldment of formation V-butt is 10 °; Root face 0mm, the 1mm of the distance between two tips weldment inwall of the little chamfering of back side processing V-arrangement, the opening angle of the little chamfering of V-arrangement is 10 °.
(4) the weldment group is right: the plate vertical fixing, bevel, do not stay the gap.
(5) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 20L/min; Welding current 125A; Weldingvoltage 18V; Speed of welding 10.0cm/min.
(6) add the sealing weld silk and accomplish filling, the welding of capping layer.
(7) weld inspection:
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the II level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 295MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 66mm, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
Embodiment 5:
(1) mother metal: almag plate 5083, specification δ=10mm.
(2) welding material: welding wire ER5183, specification φ 3.0mm.
(3) groove processing: adopt abrasive machine to dock double V-groove processing; The angle of the chamfering on the top weldment of vertical fixing (horizontal position welding mode) V-butt is 50 °; The angle of the chamfering on the bottom weldment of formation V-butt is 20 °; Root face 0mm, the 1mm of the distance between two tips weldment inwall of the little chamfering of back side processing V-arrangement, the opening angle of the little chamfering of V-arrangement is 10 °.
(4) the weldment group is right: the plate vertical fixing, bevel, do not stay the gap.
(5) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 20L/min; Welding current 125A; Weldingvoltage 18V; Speed of welding 10.0cm/min.
(6) add the sealing weld silk and accomplish filling, the welding of capping layer.
(7) weld inspection:
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the II level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 290MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 66mm, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
Embodiment 6:
(1) mother metal: aluminium alloy plate 5052, specification δ=10mm.
(2) welding material: welding wire SAlMg-5, specification φ 3.0mm.
(3) groove processing: adopt abrasive machine to dock double V-groove processing, bevel angle 600 (seeing Fig. 2 vertical position of welding), root face 0mm, the 2mm of the distance between two tips weldment inwall of the little chamfering of back side processing V-arrangement, the opening angle of the little chamfering of V-arrangement is 20 °.
(4) the weldment group is right: vertical position welding, bevel, do not stay the gap.
(5) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 25L/min; Welding current 120A; Weldingvoltage 18V; Speed of welding 8.0cm/min.
(6) add the sealing weld silk and accomplish filling, the welding of capping layer.
(10) weld inspection.
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the I level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 196MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 66mm, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
Embodiment 7:
(1) mother metal: aluminium-alloy pipe 5052, specification φ 210 * 5mm.
(2) welding material: welding wire SAlMg-5, specification φ 2.5mm.
(3) groove processing: adopt abrasive machine to dock double V-groove processing, bevel angle 500, root face 0mm, the 1.5mm of the distance between two tips weldment inwall of the little chamfering of back side processing V-arrangement, the opening angle of the little chamfering of V-arrangement is 16 °.
(4) the weldment group is right: horizontal fixed, bevel, do not stay the gap.
(5) root pass welding: do not add welding wire or add a small amount of welding wire; Argon flow amount 15L/min; Welding current 110A; Weldingvoltage 15V; Speed of welding 9.0cm/min.
(6) add the sealing weld silk and accomplish the welding of capping layer.
(7) weld inspection.
1. visual examination: the face of weld moulding is good, pore-free, crackle, defective such as lack of penetration;
2. X-ray procedure: the egative film rating is the II level of JB4730-2005 standard, and defectives such as flawless, lack of penetration, incomplete fusion do not have the pore that exceeds standard, and the weld seam inherent quality is qualified;
3. welding joint mechanical property check:
---tension test: break on mother metal, its tensile strength values is 185MPa, greater than the lower limit of mother metal standard code;
---bend test: sample is through the curved core diameter of 6.6 times of mother metal thickness, and angle of bend reaches 1800, does not see crackle, and assay is qualified.
The present invention has remedied the deficiency on the single-sided welding and double-sided forming process of traditional aluminium and aluminium alloy GTAW bevel preset clearance; Often be employed in the assembled welding process method that back of weld adds grommet in instead air separation equipment and the pipeline, both made that its welding operation was simple, welder's easy master, can make groove processing simultaneously and organize right program simplification; The groove processing capacity reduces; The welding job amount reduces, and the field Welding work efficiency is improved, and welding cost reduces.Compare with the single-sided welding and double-sided forming process method of traditional bevel preset clearance,, reduced the probability that produces pore in the welding process owing to reduced welding deposited metal amount; Because through improving groove and welding procedure method of operating; Given full play to the effect that mother metal and bevel for welding set off motlten metal; Make that root subsides, defective such as overlap, incomplete fusion, lack of penetration, crackle reduces greatly, can guarantee to weld first-time qualification rate all greater than 98%.Compare with adding grommet assembled welding process method, saved the operation of grommet material, processing and installation grommet, significantly reduced weld metal amount, engineering cost, welding and service working time etc.And because the minimizing of groove processing capacity and welding job amount can reduce airborne dust and flue dust, make the weld job environment be improved significantly, it is healthy to help the welder.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.

Claims (8)

1. the no gap welding method of an aluminium and aluminium alloy equipment or pipeline is characterized in that: comprise the following steps:
1), two weldments end face that need weld forms to be welded that is parallel to each other; Equal chamfering on two to be welded the inner side edge; Thereby form the little chamfering of V-arrangement in the inboard of two weldments two weldment butt joint backs; The distance between two tips weldment inwall 0.5 ~ 1.0mm of the little chamfering of said V-arrangement, the opening angle of the little chamfering of said V-arrangement is 40 ~ 50 °;
2), the interior lateral surface of two weldments and to be welded, the little chamfering of V-arrangement are all carried out ungrease treatment, welding wire is carried out ungrease treatment;
3), not have dwell set right for two weldments;
4), position weldering in the weldment outside;
5), use the argon tungsten-arc welding mode, adopt not add welding wire from molten method or add the welding that a small amount of welding wire is accomplished root pass, argon flow amount is 15 ~ 20L/min during welding, welding current is 100 ~ 110A, weldingvoltage is 15 ~ 18V, speed of welding is 7 ~ 9cm/min;
6), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion capping layer.
2. the no gap welding method of aluminium according to claim 1 and aluminium alloy equipment or pipeline is characterized in that: in said step 5) and the step 6), welding point with receive the 30-40mm that all extends of arc place, do not add welding wire during welding point.
3. the no gap welding method of aluminium according to claim 1 and aluminium alloy equipment or pipeline is characterized in that: after accomplishing the root pass welding, before the welding of beginning capping layer, the time interval of the two is no more than 15min.
4. the no gap welding method of an aluminium and aluminium alloy equipment or pipeline is characterized in that: comprise the following steps:
1), the outside of two weldments forms V-butt; Inboard at two weldments forms the little chamfering of V-arrangement; The root of said V-butt contacts with the tip of the little chamfering of V-arrangement, the distance between two tips weldment inwall 1 ~ 2mm of the little chamfering of said V-arrangement, and the opening angle of the little chamfering of said V-arrangement is 10 ~ 20 °;
2), the interior lateral surface of two weldments and V-butt, the little chamfering of V-arrangement are all carried out ungrease treatment, welding wire is carried out ungrease treatment;
3), not have dwell set right for two weldments;
4), in the weldment groove, position weldering;
5), use the argon tungsten-arc welding mode, evenly add a small amount of welding wire and accomplish the root pass welding, argon flow amount is 15 ~ 25L/min during welding, welding current is 110 ~ 125A, weldingvoltage is 15 ~ 18V, speed of welding is 8 ~ 10cm/min;
6), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion packed layer;
7), use argon tungsten-arc welding mode, the welding of interpolation welding wire completion capping layer.
5. the no gap welding method of aluminium according to claim 4 and aluminium alloy equipment or pipeline is characterized in that: when welding manner was downhand welding, vertical position welding or overhead welding, the opening angle of V-butt was 50 ~ 60 °; When welding manner was horizontal position welding, the opening angle of V-butt was 50 ~ 70 °, and the angle that wherein constitutes the chamfering on the top weldment of V-butt is 40 ~ 50 °, and the angle that constitutes the chamfering on the bottom weldment of V-butt is 10 ~ 20 °.
6. according to the no gap welding method of claim 4 or 5 described aluminium and aluminium alloy equipment or pipeline, it is characterized in that: in said step 5), step 6) and the step 7), welding point with receive the 30-40mm that all extends of arc place, do not add welding wire during welding point.
7. according to the no gap welding method of claim 4 or 5 described aluminium and aluminium alloy equipment or pipeline; It is characterized in that: after accomplishing the root pass welding; Before the welding of beginning packed layer, the time interval of the two is no more than 15min, after accomplishing the packed layer welding; Before the welding of beginning capping layer, the time interval of the two is no more than 15min.
8. the no gap welding method of aluminium according to claim 5 and aluminium alloy equipment or pipeline is characterized in that: when welding manner is horizontal position welding, take from top to bottom or the arrow path welding manner of alternatively up and down.
CN2012103748072A 2012-09-27 2012-09-27 Seamless welding method for aluminum and aluminum alloy or pipeline Pending CN102837115A (en)

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