CN110102861A - A kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method - Google Patents
A kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method Download PDFInfo
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- CN110102861A CN110102861A CN201910381616.0A CN201910381616A CN110102861A CN 110102861 A CN110102861 A CN 110102861A CN 201910381616 A CN201910381616 A CN 201910381616A CN 110102861 A CN110102861 A CN 110102861A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
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Abstract
This disclosure relates to which a kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method, specific steps are as follows: the groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is opposite；It is welded using gas metal-arc welding；The preceding electric arc that ignites at 8-12mm in front of solder joint gentle slope of welding, is quickly rocked to groove root, electric arc is made to burn groove root, molten iron fuses completely with groove root；It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode is used during welding, welding wire and workpiece keep 80~85 ° of angles that have a down dip, and welding wire should head on the forward movement of molten bath molten iron, and welding wire slightly stops on groove both sides, intermediate fast transition；The fusion length of tack welding is 10-20mm, and thickness is no more than the 2/3 of tube wall thickness and must not exceed 10mm.Avoid that droplet transfer formation overlap not of uniform size occurs in root weld back-welding shape or the defects of lack of penetration, indent not enough occurs in heat.
Description
Technical field
The disclosure belongs to pipeline gas metal-arc welding technical field, and in particular to a kind of gas metal-arc welding is molten
Drop transition accurately controls one side welding with back formation method.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
In the welding of metallic conduit banjo fixing butt jointing, bottoming technique is always the important ring for influencing welding efficiency and welding quality
Section, the welding method selected at this stage mainly have hand tungsten argon arc welding, Cellulose-Congo red medium down hill welding, welding electrode arc welding etc., and
The problems such as these types of welding method generally existing welding efficiency when backing welding is applied is low or postwelding quality of weld seam molding is poor, due to
The welding procedure welding quality of pipeline backing welding is more demanding, the common welding efficiency such as submerged-arc welding, common consumable electrode gas shield welding
High welding method is all unable to get application in the welding of pipeline backing welding.
Carbon steel piping consumable electrode gas-arc bottoming automatic soldering technique, invention are recorded in application number 201310471155.9
People has found that it cannot reach the welding requirements of single face welding and double face shaping, and the welding back side overlap or heat easily occurs and not enough occurs not welding
Thoroughly, the defects of indent.
Summary of the invention
For above-mentioned problems of the prior art, a purpose of the disclosure is to provide a kind of consumable electrode gas-arc
The weldering droplet transfer accurately controls one side welding with back formation method.The disclosure is one kind in petrochemical industry metallic conduit welding procedure
In, by gas metal-arc welding pipeline bottom welding one side welding with back formation method.
In order to solve the above technical problems, the technical solution of the disclosure are as follows:
A kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method, specific steps are as follows:
The groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is opposite；It is protected using consumable electrode gas
Shield is welded；The preceding electric arc that ignites at 8-12mm in front of tack-weld gentle slope of welding, is quickly rocked to groove root, makes electricity
To groove root, molten iron fuses completely with groove root for arcing；
It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode is used during welding,
Welding wire and workpiece keep 65~75 ° of angles that have a down dip, and welding wire should head on the forward movement of molten bath molten iron, and welding wire slightly stops on groove both sides
It stays, intermediate fast transition；
The fusion length of tack welding is 10-20mm, and thickness is no more than the 2/3 of tube wall thickness and must not exceed 10mm.
The effect of " welding wire slightly stops on groove both sides, intermediate fast transition " is that front forming both sides is avoided to generate folder
Ditch；" fusion length of tack welding is 10-20mm, and thickness, which is no more than the 2/3 of tube wall thickness and must not exceed the effect of 10mm ", is
Guarantee that through welding and fusion are good, and the defects of pore-free, slag inclusion.
In the welding process of the disclosure in welding process when the droplet transfer molten drop size, quantity and transition frequency etc.
The adjustment refined, reaches each drop molten iron, each molten drop is precise controlling and accurate identical, to pass through essence
Really control molten drop reaches one side welding with back formation when guaranteeing root bead, meanwhile, cooperate group when welding process to feature, welding gun angle
Degree and the operation technique of all position welding difference welding position, avoid root weld back-welding shape from droplet transfer size occur not
Not enough there is the defects of lack of penetration, indent in one formation overlap or heat, while protruding gas metal-arc welding welding deformation again
Small, the high feature of welding efficiency improves the welding method of pipeline root bead.
The disclosure the utility model has the advantages that
1) the root bead welding of various metal pipeline materials, the root bead welding including pipelines such as carbon steel, stainless steel, steel alloys,
Electric arc penetration power is strong, when bottom welding, can the effective melt-through weld back side, molten drop transition frequency is high, small to the disturbance in molten bath, can be with
Fabulous control molten bath；
2) electric current can reduce thermal weld stress 10~30% in welding process, reduces and generates splashing in welding process；
The welding of metallic conduit backing welding all positon can be achieved；
3) ignite after electric arc, be quickly rocked to root, welding wire heads on the forward movement of molten bath molten iron, welding wire groove both sides slightly
It stops, intermediate quickly excessive, the process of welding is by the way of small swing, and in conjunction with the inclined angle of welding wire, speed of welding can
It is 4-7 times of conventional manual argon tungsten-arc welding to reach 200-400mm/min；Appearance of weld is beautiful, and welding quality is good, improves
The efficiency of welding；
4) big to the geometric dimension scope of application to group, reduce required precision of the butt welding mouth group to size；
5) simple and convenient operation requires welder's level of skill lower than other welding methods.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the present application, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the disclosure.
Fig. 1 is droplet transfer block diagram；
Fig. 2 is welding groove form figure, and (a) refers to double V-groove form, (b) refers to double-fold double V-groove form；
Fig. 3 is welding process flow figure；
Fig. 4 is the position view of tack welding；
Fig. 5 is the angle schematic diagram of welding gun；
Fig. 6 is different welding method welding process comparison diagrams；
Fig. 7 is the appearance of weld figure after welding；
Fig. 8 is the comparison diagram for the weld seam that comparative example 1 and embodiment 1 obtain, and wherein a is the weld seam figure of embodiment 1, and b is pair
The weld seam figure of ratio 1；
Fig. 9 is the comparison diagram for the weld seam that comparative example 2 and embodiment 1 obtain, and wherein a is the weld seam figure of embodiment 1, and b is pair
The weld seam figure of ratio 2.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Tack welding is spot welding carried out to positioning for group in groove before welding.
Stem elongation degree refers to distance of the welding head away from ignition tip end.
Tack welding is to carry out in welding point region for fixing gap, unfitness of butt joint required by guaranteeing workpiece group clock synchronization
Fixed spot welding.
A kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method, specific steps are as follows:
The groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is opposite；It is protected using consumable electrode gas
Shield is welded；The preceding electric arc that ignites at 8-12mm in front of tack-weld gentle slope of welding, is quickly rocked to groove root, makes electricity
To groove root, molten iron fuses completely with groove root for arcing；
It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode is used during welding,
Welding wire and workpiece keep 65~75 ° of angles that have a down dip, and welding wire should head on the forward movement of molten bath molten iron, and welding wire slightly stops on groove both sides
It stays, intermediate fast transition；
The fusion length of tack welding is 10-18mm, and thickness is no more than the 2/3 of tube wall thickness and must not exceed 10mm.
For the length of arc welding generally in 20-50mm, the effect of tack welding is the connector area progress in welding in the prior art
Temporary weld makes pipe assembly securely, with it is no-welding when misplace, the fusion length of tack welding is less than existing in the disclosure
Fusion length because inventors have found that the fusion length of tack welding within the above range when keep the appearance of weld of tack welding more beautiful
It sees, the selection of the fusion length of tack welding enables the position of linking preferably to form.
Preferably, the form of the groove is double V-groove.
It is further preferred that wall thickness≤25mm of the corresponding pipeline of double V-groove.
It is further preferred that the angle of double V-groove is 40-50 °.
It is further preferred that the group of groove is 3-5mm to gap.
Preferably, the position of tack welding is located at 12 points of pipe welding port, and 4 points, 8 positions.
The position setting of tack welding helps to prevent vertical position welding from solder joint and connector occur in and 9 positions in the process at 3 points.
Preferably, the protective gas in welding process is CO2Gas or CO2The mixed gas of gas and Ar.
It is further preferred that the CO containing 15-25% in protection gas2The Ar of gas and 75-85%.
It is further preferred that protection air-flow amount is 15~20L/min.
Preferably, welding process one-pass molding, molten iron is slightly hung a bit to groove two sides during welding.
One-time continuous welding should be completed as far as possible, the quantity of weld seam center tap be reduced, due to the effect downhand welding of gravity when welding
Position is easy to appear the case where back side overlap.
Preferably, torch swinging answers intermediate fast both sides slightly to stop during overhead welding, and receiving arc is more than 6 position 20-30mm.
Overhead position swing answers intermediate fast both sides slightly to stop convex both sides among the forming tenesmus of weld seam front is avoided to have folder ditch；
Receiving arc is more than 6 position 20-30mm, in favor of next section of welding line joint.
Preferably, the stem elongation degree in welding process is 10-12mm.
This stem elongation degree observes molten bath convenient for operation, guarantees electric current, voltage and arc stability in welding process.
Preferably, the electric current 110-130A in welding process, voltage 15-17V.
(burn-off rate is too fast) arc length is elongated when overtension, and splashing particle becomes larger, and is also easy to produce stomata, and welding bead is wide and flat,
Fusion penetration and reinforcement become smaller；(burn-off rate is partially slow) welding wire is inserted to base material when brownout, is splashed and is increased, and welding bead narrows, fusion penetration and
Reinforcement is big.
Application of the above method in welded pipe line.
Preferably, the pipeline is that the root bead of carbon steel piping material welds.
The disclosure is further illustrated below with reference to embodiment
Embodiment 1
The wall thickness of pipeline is 20mm.
Metal transfer of MIG/MAG accurately controls one side welding with back formation method, specific steps are as follows:
The groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is formed into double V-groove, V-type slope relatively
The angle of mouth is 50 °, and the group of groove is 3mm to gap；Using CO2For gas as protective gas, protecting the flow of gas is 15L/
Min is welded using gas metal-arc welding, and the electric current of welding is 110A, voltage 15V；On solder joint gentle slope before welding
Ignite electric arc at the 10mm of front, is quickly rocked to groove root, and electric arc is made to burn groove root, and molten iron and groove root are completely molten
It closes；
It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode is used during welding,
Welding wire and workpiece keep the 70 ° of angles that have a down dip, and stem elongation degree is 11mm, and welding wire should head on the forward movement of molten bath molten iron, and welding wire is on slope
Mouth both sides slightly stop, intermediate fast transition, and the fusion length of tack welding is 10mm, and with a thickness of 5mm, welding gun is put during overhead welding
Dynamic that intermediate fast both sides is answered to stop, receiving arc is more than 6 position 20mm.Welding process one-pass molding, the fusion length of tack welding are 10mm,
With a thickness of 5mm.
Embodiment 2
The wall thickness of pipeline is 30mm.
Metal transfer of MIG/MAG accurately controls one side welding with back formation method, specific steps are as follows:
The groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is formed into double V-groove, V-type slope relatively
The angle of mouth is 45 °, and the group of groove is 4mm to gap；Using CO2The mixed gas of gas and Ar are as protective gas, protection
In gas containing 18% CO2Gas and 75% Ar, protect gas flow be 18L/min, using gas metal-arc welding into
Row welding, the electric current of welding are 120A, voltage 16V；The preceding electric arc that ignites at 11mm in front of solder joint gentle slope of welding, quickly swings
To groove root, electric arc is made to burn groove root, molten iron fuses completely with groove root；
It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode is used during welding,
Welding wire and workpiece keep the 72 ° of angles that have a down dip, and stem elongation degree is 12mm, and welding wire should head on the forward movement of molten bath molten iron, and welding wire is on slope
Mouth both sides slightly stop, intermediate fast transition, and the fusion length of tack welding is 12mm, and with a thickness of 6mm, welding gun is put during overhead welding
Dynamic that intermediate fast both sides is answered to stop, receiving arc is more than 6 position 25mm.Welding process one-pass molding.
Comparative example 1
The length 25mm of tack welding unlike the first embodiment, thickness 15mm.
Comparative example 2
Voltage is 13V unlike the first embodiment.
As shown in Figure 1, being the droplet transfer control process of the application, it can be seen that entire welding process uses special electricity
Arc welding characteristic prevents molten bath excessive turbulence using lower thermal weld stress.Each step process of droplet transfer is as follows:
Ignite electric arc first, and molten drop enters 1 welding wire and molten bath short-circuit stage, and the bead of welding wire end is allowed to immerse molten bath, subsequently into 2 welderings
Silk necking stage, electric current increases to sufficiently high, to form constriction, enters back into 3 welding wires and molten bath disconnected phase, and lasting limitation increases
Constriction electric current detects short-circuit bridges with limiting short-circuit current, enters 4 welding wire arc stages afterwards, before short circuit disconnects, rapidly
Electric current is reduced, will not be short-circuit with guarantee to a lower level, the ball stage is melted subsequently into 5 welding wires, maximum current is to form
Molten ball, while preparing the droplet transfer next time, finally entered for 6 arc maintenance stages, electric current drops to a lower level, it is sufficient to be formed
Short circuit repeats into 1 and carries out the droplet transfer, and whole process carries out different control by each stage to the droplet transfer,
Finally obtain satisfied droplet transfer state.
As shown in Fig. 2, being two kinds of groove types of the application, the respectively molecular double V-groove of wall thickness≤25mm pipe
With the molecular double V-groove of pipe of two kinds of wall thickness > 25mm.
As shown in figure 4, the position view of the tack welding for the application, vertical position of welding molten iron falls molten under the action of by gravity
It is deep very shallow, it avoids solder joint and connector occur in and 9 positions at 3 points as far as possible, solder joint is worn into oblique gentle slope shape before weldering, to be conducive to
Connector fusion.The end face of pipe groove circle as shown in Figure 4, in order to avoid solder joint occurs in the vertical position welding after tack welding and connects
Head, the position of the tack welding before vertical position welding is respectively at 12 points, 4 points, 8 points.
It is illustrated in figure 5 angle of welding gun schematic diagram, circle shown in Fig. 5 is the end face of pipe, welding gun and pipe end face
Angle between tangent line is 65-75 °, and carries out the welding of tack welding clockwise, i.e. successively 12 points of progress, 4 points, 8
The welding of point is set to closing in position in 8 points, 20-30mm after the point that closes up is located at 6 points.
As shown in fig. 6, being successively welding electrode arc welding, argon tungsten-arc welding, disclosure the method from left to right, it can be seen that
The appearance of weld that the welding method of the disclosure obtains is preferable；
As shown in fig. 7, the welding method of the available disclosure, weld seam front and back of weld can be formed simultaneously preferably
Shape.
As shown in figure 8, being welded using tack welding parameter in comparative example 1, the tack welding parameter compared to embodiment 1 is made
The problem of cannot being formed at weld seam.
As shown in figure 9, the voltage of comparative example 2 is relatively small, being used cooperatively during the welding process with other parameters cannot
Preferable weld seam is obtained, a large amount of splash is generated in welding process.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of metal transfer of MIG/MAG accurately controls one side welding with back formation method, it is characterised in that: specific
Step are as follows:
The groove in two root canal roads is subjected to cleaning and reconditioning, the groove of two pipelines is opposite；Using gas metal-arc welding
It is welded；The preceding electric arc that ignites at 8-12mm in front of solder joint gentle slope of welding, is quickly rocked to groove root, electric arc is made to burn slope
Mouth root, molten iron fuse completely with groove root；
It is successively welded from top to bottom by the position of pipe welding port cross section 12；Small swing mode, welding wire are used during welding
65~75 ° of angles that have a down dip are kept with workpiece, welding wire should head on the forward movement of molten bath molten iron, and welding wire slightly stops on groove both sides,
Intermediate fast transition；
The fusion length of tack welding is 10-20mm, and thickness is no more than the 2/3 of tube wall thickness and must not exceed 10mm.
2. according to the method described in claim 1, it is characterized by: the form of the groove is double V-groove；
Preferably, wall thickness≤25mm of the corresponding pipeline of double V-groove；
Preferably, the angle of double V-groove is 40-50 °；
Preferably, the group of groove is 3-5mm to gap.
3. according to the method described in claim 1, it is characterized by: the position of tack welding is located at 12 points of pipe welding port, 4 points, 8
Point position.
4. according to the method described in claim 1, it is characterized by: the protective gas in welding process is CO2Gas or CO2
The mixed gas of gas and Ar；
Preferably, the CO containing 15-25% in gas is protected2The Ar of gas and 75-85%.
5. according to the method described in claim 4, it is characterized by: protection air-flow amount is 15~20L/min.
6. according to the method described in claim 1, it is characterized by: welding process one-pass molding, during welding molten iron to
Groove two sides are slightly hung a bit.
7. according to the method described in claim 1, receiving it is characterized by: torch swinging answers intermediate fast both sides to stop during overhead welding
Arc is more than 6 position 20-30mm.
8. according to the method described in claim 1, it is characterized by: the stem elongation degree in welding process is 10-12mm.
9. according to the method described in claim 1, it is characterized by: electric current 110-130A, voltage 15-17V in welding process.
10. the described in any item metal transfer of MIG/MAG of claim 1-9 accurately control one side welding with back formation
Application of the method in welded pipe line.
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| CN113798645A (en) * | 2021-09-02 | 2021-12-17 | 中国核电工程有限公司 | Backing welding gun and backing welding method |
| CN113894387A (en) * | 2021-09-30 | 2022-01-07 | 北京博清科技有限公司 | Robot automatic welding process method |
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| CN113894387A (en) * | 2021-09-30 | 2022-01-07 | 北京博清科技有限公司 | Robot automatic welding process method |
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Application publication date: 20190809 |