CN107052576B - Method of the runner cavity without splashing high power laser light penetration weld - Google Patents
Method of the runner cavity without splashing high power laser light penetration weld Download PDFInfo
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- CN107052576B CN107052576B CN201611230271.1A CN201611230271A CN107052576B CN 107052576 B CN107052576 B CN 107052576B CN 201611230271 A CN201611230271 A CN 201611230271A CN 107052576 B CN107052576 B CN 107052576B
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Classifications
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The present invention proposes a kind of method of the runner cavity without splashing high power laser light penetration weld, this method comprises: carrying out welding point cleaning and spraying in workpiece inner wall to prevent splash agent；Workpiece is assembled, adjustment frock clamp ensures that welding point position fits closely, and strict control joint misalignment size；Laser welding head is moved into a preset height above workpiece to be welded, and makes laser beam alignment pieces welding point；Protection gas hood is installed on laser welding head, adjustment protection gas hood and laser beam, welding point to a default relative position；Protection gas hood is opened, mobile laser welding head carries out welding point laser spot welding and fixes；And inertial weld protection gas is passed through in workpiece cavity, it regulates each laser weld parameters to preset value progress high power laser light and continuously welds.The generation of spatter can be efficiently controlled, it is ensured that runner cavity is without splashing.
Description
Technical field
The present invention relates to laser processing more particularly to the method for laser welding of runner cavity.
Background technique
Laser welding is therefore widely used in each due to having many advantages, such as that speed is fast, the depth of weld is big and deformation is small
Each industry of row is particularly suitable for the product of some precise parts and high-quality welding requirement.Runner cavity base part is widely used in
Energy industry, for nuclear power industry, the throat thickness of runner capsule components is big, it is desirable that and post welding distortion is small, and
It is high to the surface requirements of inside cavity postwelding: to must assure that postwelding, spatter particle of the cavity inner wall without attachment is to adapt to
Its harsh application environment guarantees high security.
Under the conditions of High Power Laser Welding, with the increase of plate thickness and laser power, welding process stability can be deteriorated,
The spatter of weld seam front and back sides also increases as.Since laser welding is splashed, just by laser parameter, speed of welding, weld seam
The influence of many factors such as reverse side protected mode, workpiece assembly precision, therefore how spatter is controlled, it is high request flow passage chamber
The problem that the welding of body base part needs to solve.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, propose a kind of runner cavity without
The method of splashing high power laser light penetration weld, can efficiently control the generation of spatter, it is ensured that runner cavity is without splashing.
The technical solution adopted by the present invention to solve the technical problems is: it is sharp without splashing high power to provide a kind of runner cavity
The method of light penetration weld, comprising the following steps:
It carries out welding point cleaning and sprays in workpiece inner wall to prevent splash agent；
Workpiece is assembled, adjustment frock clamp ensures that welding point position fits closely, and strict control joint
Misalignment size；
Laser welding head is moved into a preset height above workpiece to be welded, and makes laser beam alignment pieces welding point；
Protection gas hood is installed on laser welding head, adjustment protection gas hood and laser beam, welding point to a default phase
To position；
Protection gas hood is opened, mobile laser welding head carries out welding point laser spot welding and fixes；And
It is passed through inertial weld protection gas in workpiece cavity, regulates each laser weld parameters to preset value progress high power and swashs
Light continuously welds.
Wherein, solidifiable is paste after the ejection that prevents splash agent；It is described to prevent splash agent after workpiece welds, height can be passed through
Pressure water flow is rinsed well.
Wherein, the welding point position, which fits closely, refers to, the gap that workpiece welding point fits closely is less than
0.05mm；The strict control joint misalignment size refers to that connector misalignment is less than 0.2mm.
Wherein, make the distance range 3 of the front end face for protecting gas hood and the laser beam of laser welding head sending to 10mm；And
Make to protect the distance range 5 of the welding point on the lower end surface and workpiece of gas hood to 15mm.
Wherein, the protection gas hood be Multifunctional protective tyre protecting shield, have the function of it is horizontal blow, it is side-blown and drag cover protection three；Its
In, the horizontal inert protective gas pressure being passed through of blowing of the protection gas hood is 0.2 to 0.5Mpa, the side-blown inert protective gas being passed through
Flow is 10 to 50L/min, and the inert protective gas pressure for dragging cover to be passed through is 0.3 to 0.6Mpa.
Wherein, in spot welding, protection gas hood need to be opened and be passed through inertial weld protective gas into workpiece cavity, prevent solder joint
Oxidation by air；Before continuously weld, need to be passed through inertial weld protective gas in workpiece cavity, protective gas is from stream
Road entrance is passed through and flows out from runner exit, and keeps protective gas circulation until welding is completed.
Wherein, in carrying out continuous welding process, the fluctuation range of the preset height is made to be less than 1mm, and make laser power
Fluctuation range be less than 10W.
The technical solution adopted by the present invention to solve the technical problems is still: providing a kind of high without splashing based on runner cavity
The method of power laser penetration welder, the runner cavity include laser welding head without splashing high power laser light penetration welder
With protection gas hood, which is installed in the laser welding head；Wherein, which it is pre- to be located at workpiece top one to be welded
If height, the welding point on the laser beam and workpiece to be welded of the protection gas hood and laser welding head outgoing has one to preset
Relative position；Wherein, the method includes the steps:
It carries out welding point cleaning and sprays in workpiece inner wall to prevent splash agent；Workpiece is assembled, adjustment tooling folder
Tool ensures that welding point position fits closely, and strict control joint misalignment size；Laser welding head is moved into workpiece to be welded
One preset height of top, and make laser beam alignment pieces welding point；Protection gas hood is installed on laser welding head, adjustment is protected
Tyre protecting shield and laser beam, welding point to a default relative position；Protection gas hood is opened, mobile laser welding head connect
Head laser spot welding is fixed；And inertial weld protection gas is passed through in workpiece cavity, each laser weld parameters are regulated to preset value
High power laser light is carried out continuously to weld.
Wherein, the distance range of the front end face of the protection gas hood and laser beam is 3 to 10mm；The lower end surface of the protection gas hood
Distance range with the welding point on workpiece is 5 to 15mm.
Wherein, the range of the preset height is 0 to 15mm, in the welding process, keeps the fluctuation range of the preset height small
In 1mm, and the fluctuation range for the laser power for providing the laser welding head is less than 10W.
The beneficial effects of the present invention are can be effectively reduced welding by the selection to prevent splash agent in back of weld
Splashing is attached to runner cavity inner wall；By the strict control to workpiece installation accuracy, it can effectively guarantee laser penetration weld
Stability；It by the selection of weld seam front and back sides protected mode, can play a good protective effect to weld seam, so that weld seam light
Sliding uniform non-oxidation is further able to reduce the generation of spatter；By the accurate control of laser parameter, it can guarantee weld seam
The uniformity of penetration prevents from flying greatly caused by non-penetration caused by laser power density deficiency or laser power density are excessive
It splashes, so as to efficiently control the generation of spatter, it is ensured that runner cavity is without splashing.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural representation of workpiece involved by the present invention；
Fig. 2 is the structural representation of the device of the invention Yu the workpiece；
Fig. 3 is the flow diagram of method of the invention.
Specific embodiment
Now in conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
Referring to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of workpiece involved by the present invention.Fig. 2 is the device of the invention and the work
The structural representation of part.Workpiece 110 involved by the present invention includes: workpiece lower plate 111 and workpiece upper plate 112.Wherein, workpiece lower plate 111
Interior sky is formed with runner cavity 113.Workpiece lower plate 111 is simultaneously equipped with the flow channel entry point 114 being connected to the runner cavity 113 and stream
Road outlet 115.It is appreciated that workpiece upper plate 112 is the cover board matched with the workpiece lower plate 111, the two can be welded to one
It rises, forms a runner cavity base part.
The inventive system comprises protection gas hood 120 and laser welding heads 130.The laser welding head 130 is capable of providing sharp
Light beam 131.After installing workpiece 110, laser welding head 130 is moved into 110 one preset height of top of workpiece.The default height
Spend the laser spot height adapted to by 110 joint throat thickness of workpiece.The laser spot height can be by advance in lab scale
Welding test is carried out on plate and is obtained, and is one of important parameter of laser welding.In the present embodiment, the laser spot height
The range of (i.e. the preset height) is 0 to 15mm.After laser welding head 130 moves to reach the preset height, continue to translate
Laser welding head 130 makes the welding point for 131 alignment pieces 110 of laser beam being emitted from laser welding head 130, so as to subsequent
Carry out the installation of protection gas hood 120.
Protection gas hood 120 is installed on laser welding head 130.By adjusting installation site, can make to protect gas hood 120
Front end face and laser beam 131 keep a pre-determined distance.In the present embodiment, the range of the pre-determined distance is 3 to 10mm.In addition,
The distance range of the lower end surface and the welding point on workpiece 110 of protecting gas hood 120 is 5 to 15mm.It is understood that protection
Gas hood 120 is too small or excessive at a distance from laser beam 131 and workpiece 110, is all unfavorable for that gas hood 120 is protected to play welding pool
Sufficient protecting effect causes to die down to spatter control effect, is unfavorable for reaching nothing in the runner cavity 113 of workpiece 110
The requirement of splashing.
Specifically, protection gas hood 120 be Multifunctional protective tyre protecting shield, have the function of it is horizontal blow, be side-blown, drag cover protection three.
In welding, welding protective gas is each led into, is had to plasma torch caused by High Power Laser Welding and flue dust height
There is good inhibiting effect, when can reduce high power laser light weldering, plasma torch and flue dust are to laser beam 131 above molten bath
Interference and shielding action, so that stabilized welding process, reduces spatter, while can also play to weld seam good anti-oxidation
Protective effect.In the present embodiment, when welding, protection gas hood 120 it is horizontal blow the inert protective gas pressure that is passed through be 0.2 to
0.5Mpa；The side-blown inert protective gas flow being passed through is 10 to 50L/min；The inert protective gas pressure for dragging cover to be passed through is
0.3 to 0.6Mpa.
It is the flow diagram of method of the invention referring to Fig. 3, Fig. 3.It is high without splashing that the present invention provides a kind of runner cavity
The method of power laser penetration weld carries out high power laser light after fitting closely workpiece upper plate 112 and workpiece lower plate 111
Penetration weld.When welding, the outer surface (front corresponding to weld seam) of workpiece 110 is protected using protection gas hood 120；Workpiece
110 inner surface (back side corresponding to weld seam) is protected by being passed through inert gas in flow channel entry point 114.After welding,
113 inner wall of runner cavity can satisfy high-quality welding requirement without attachment splashing particle.This method specifically includes the following steps:
Step S110, it carries out welding point cleaning and sprays in workpiece inner wall to prevent splash agent.Specifically, workpiece is being carried out
Before the assembly of upper plate 112 and workpiece lower plate 111, the connector that is first bonded workpiece upper plate 112 and workpiece lower plate 111 with cleaning agent
Place cleans up, and removes the greasy dirt for influencing welding process stability and weldquality.Then, the connector packet to be welded that will be cleaned out
It wraps, sprays prevent splash agent at workpiece upper plate 112 and the inner wall of workpiece lower plate 111 respectively.It is quiet to put after spraying is completed, etc.
Wait prevent splash agent by settable liquid into paste.
Step S120, workpiece is assembled, adjustment frock clamp ensures that welding point position fits closely, and strictly controls
Misalignment size in joint processed.Specifically, it after abovementioned steps S110 is sprayed at the preventing splash agent and be frozen into paste of workpiece inner wall, goes
Except the wrappage of 111 joint of workpiece upper plate 112 and workpiece lower plate.Workpiece upper plate 112 and workpiece lower plate 111 are placed in tooling
On fixture, clamping tool will fit closely at 111 welding point of workpiece upper plate 112 and workpiece lower plate.Check 112 He of workpiece upper plate
The fitting situation of workpiece lower plate 111, constantly adjustment frock clamp, optimization workpiece upper plate 112 weld after being bonded with workpiece lower plate 111
The gap of joint and misalignment.It is understood that the excessive penetrability for easily causing laser in joint gap increases, weldering can be increased
The splashing at laser molten pool back in termination process, postwelding are unfavorable for removal and splash；Misalignment is excessive equivalent to increase throat thickness, meeting
The penetration for influencing laser causes laser beam welding unstable and generates biggish splashing and cause appearance of weld uneven
It is even.Therefore, it is necessary to the size of the fit-up gap and misalignment of strict control workpiece upper plate 112 and workpiece lower plate 111.In the present embodiment
In, it is desirable that fit-up gap is less than 0.05mm, and misalignment is less than 0.2mm.
Step S130, laser welding head is moved into a preset height above workpiece to be welded, and welds laser beam alignment pieces
Connector.Specifically, after above-mentioned steps S120 installs workpiece 110, laser welding head 130 is moved into 110 top of workpiece
One preset height.In the present embodiment, the range of the preset height is 0 to 15mm.It is moved to reach in laser welding head 130 default
After height, continues to translate laser welding head, make the welding for 131 alignment pieces 110 of laser beam being emitted from laser welding head 130
Connector, so as to the subsequent installation for carrying out protection gas hood 120.
Step S140, protection gas hood is installed on laser welding head, adjustment protection gas hood and laser beam, welding point are extremely
One default relative position.Specifically, abovementioned steps S130 determine laser welding head 130 and workpiece 110 positional relationship it
Afterwards, protection gas hood 120 is installed on laser welding head 130, by adjusting installation site, makes the front end face for protecting gas hood 120
A pre-determined distance is kept with laser beam 131, the lower end surface of gas hood 120 and the welding point on workpiece 110 is protected to keep one to preset
Distance.In the present embodiment, the distance range of protection 120 front end face of gas hood and laser beam 131 is 3 to 10mm, protects gas hood 120
Lower end surface and workpiece 110 on welding point distance range be 5 to 15mm.
Step S150, protection gas hood is opened, mobile laser welding head carries out welding point laser spot welding and fixes.Specifically,
Laser beam 131 is opened, mobile laser welding head 130 carries out laser dotting weldering on the welding point of workpiece 110.When spot welding, need
Protection gas hood 120 is opened, prevents solder joint oxidation by air from blacking, influences subsequent high power laser light sequential welding.Carry out spot welding
When fixed, settable lesser spot welding laser power achievees the purpose that fixed workpiece upper plate 112 and workpiece lower plate 111.Point
The length of the visual welding point of the quantity of weldering is uniformly arranged: can respectively be arranged a bit in the head and the tail of welding point, middle section can between
It is uniformly distributed every a pre-determined distance.In the present embodiment, welded spot pitch distance is 100 to 150mm.It is understood that this step
In rapid, laser spot welding is the workpiece upper plate 112 and workpiece lower plate 111 in order to more effectively fix workpiece 110, is prevented in high power
In welding process, misalignment is opened due to welding deformation or occurred to workpiece upper plate 112 and workpiece lower plate 111.Opening or misalignment
It is unfavorable for the control of spatter, more seriously, it is possible to weld seam significant depressions can be made, workpiece 110 is caused to scrap.
Step S160, be passed through in workpiece cavity inertial weld protection gas, regulate each laser weld parameters to preset value into
Row high power laser light continuously welds.Specifically, before welding, inertial weld is protected into runner of the gas from 110 rear end of workpiece in advance
Entrance 114 is constantly passed through, and is flowed out from the runner exit 115 of 110 front end of workpiece, which can will be in runner cavity 113
Air discharge, and prevent air from entering in runner cavity 113.By the inner wall of inert gas shielding runner cavity 113, be conducive to
The control of spatter simultaneously improves weldquality.In this example, the inert gas flow being passed through may be configured as 10~50L/
min.It is passed through in runner after inertial weld protection gas, settable good each laser weld parameters, mainly include laser power, laser
Focal spot height, speed of welding etc..These parameters can test on test plate (panel) in advance according to the actually required throat thickness of workpiece 110
Out.It considers: the control stress point of spatter being to control the fluctuating change of laser spot height and laser power,
In the present embodiment, the fluctuation range of laser spot height (preset height i.e. above-mentioned) in the welding process is set to be less than 1mm, and make
The fluctuation range of laser power is less than 10W.After setting each laser weld parameters, protection gas hood 120 is opened, laser beam is opened
131, mobile laser welding head 130 carries out high power laser light along the welding point on workpiece 110 and continuously welds.
Step S170, it after the completion of workpiece welding, is passed through in cavity inside high pressure water cleaning and prevents splash agent and weld dust.Tool
Body, high pressure water is passed through from the flow channel entry point 114 of workpiece 110, after runner cavity 113, is discharged from runner exit 115.
High pressure water flow can wash away the inner wall of runner cavity 113, take away the dust formed when welding and step S110 is sprayed at work
Part inner wall prevents splash agent.
The beneficial effects of the present invention are anti-by the back side (i.e. the inner wall of runner cavity 113) of the weld seam to workpiece 110
The selection of splashing agent can be effectively reduced the inner wall that spatter is attached to runner cavity 113；Pass through the peace to workpiece 110
The strict control for filling precision, can effectively guarantee the stability of laser penetration weld；Pass through the choosing of weld seam front and back sides protected mode
It selects, can play a good protective effect to weld seam, so that the uniform non-oxidation of smooth welding joint, is further able to reduce spatter
Generation；It by the accurate control of laser parameter, can guarantee the uniformity of joint penetration, prevent laser power density deficiency from making
At non-penetration or laser power density it is excessive caused by splash greatly, so as to efficiently control the generation of spatter,
Ensure runner cavity without splashing.
It should be understood that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, to ability
It for field technique personnel, can modify to technical solution illustrated in the above embodiments, or special to part of technology
Sign is equivalently replaced；And these modifications and replacement, it should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of method of the runner cavity without splashing high power laser light penetration weld, it is characterised in that: the following steps are included:
It carries out welding point cleaning and sprays in workpiece inner wall to prevent splash agent；
Workpiece is assembled, adjustment frock clamp ensures that welding point position fits closely, and strict control joint misalignment
Size；
Laser welding head is moved into a preset height above workpiece to be welded, and makes laser beam alignment pieces welding point；
Protection gas hood is installed on laser welding head, adjustment protection gas hood and laser beam, welding point to a default opposite position
It sets；
Protection gas hood is opened, mobile laser welding head carries out welding point laser spot welding and fixes；And
It is passed through inertial weld protection gas in workpiece cavity, regulates each laser weld parameters to preset value and carries out high power laser light company
Continuous welding.
2. according to the method described in claim 1, it is characterized by: it is described prevent splash agent ejection after solidifiable be paste；It is described
It prevents splash agent after workpiece welds, can be rinsed well by high pressure water flow.
3. according to the method described in claim 1, it is characterized by: the welding point position fits closely and refers to, workpiece
The gap that welding point fits closely is less than 0.05mm；The strict control joint misalignment size refers to that connector misalignment is small
In 0.2mm.
4. according to the method described in claim 1, it is characterized by: issuing the front end face for protecting gas hood and laser welding head
The distance range of laser beam is 3 to 10mm；And make to protect the distance range 5 of the welding point on the lower end surface and workpiece of gas hood
To 15mm.
5. according to the method described in claim 1, there is cross it is characterized by: the protection gas hood is Multifunctional protective tyre protecting shield
Blow, it is side-blown and drag cover protect three functions；Wherein, the protection gas hood it is horizontal blow the inert protective gas pressure that is passed through be 0.2 to
0.5Mpa, the side-blown inert protective gas flow being passed through are 10 to 50L/min, and the inert protective gas pressure for dragging cover to be passed through is
0.3 to 0.6Mpa.
6. method of the runner cavity without splashing high power laser light penetration weld according to claim 1, it is characterised in that: in point
When weldering, protection gas hood need to be opened and be passed through inertial weld protective gas into workpiece cavity, prevent solder joint oxidation by air；Carry out
Before continuous welding, need to be passed through inertial weld protective gas in workpiece cavity, protective gas is passed through from flow channel entry point and from stream
Road outlet outflow, and protective gas circulation is kept until welding is completed.
7. according to the method described in claim 1, it is characterized by: making the preset height in carrying out continuous welding process
Fluctuation range is less than 1mm, and the fluctuation range of laser power is made to be less than 10W.
8. a kind of method based on runner cavity without splashing high power laser light penetration welder, which is characterized in that the flow passage chamber
Body includes laser welding head and protection gas hood without splashing high power laser light penetration welder, which is installed in the Laser Welding
Connector；Wherein, which is located at a preset height above workpiece to be welded, and the protection gas hood and the laser welding head are emitted
Laser beam and workpiece to be welded welding point have a default relative position；Wherein, the method includes the steps:
It carries out welding point cleaning and sprays in workpiece inner wall to prevent splash agent；Workpiece is assembled, adjustment frock clamp is true
It protects welding point position to fit closely, and strict control joint misalignment size；Laser welding head is moved to above workpiece to be welded
One preset height, and make laser beam alignment pieces welding point；Protection gas hood is installed on laser welding head, adjustment protection gas
Cover and laser beam, welding point to a default relative position；Protection gas hood is opened, mobile laser welding head carries out welding point and swashs
Luminous point solid welding is fixed；And inertial weld protection gas is passed through in workpiece cavity, it regulates each laser weld parameters to preset value and carries out
High power laser light continuously welds.
9. according to the method described in claim 8, it is characterized by: the front end face of the protection gas hood and the distance range of laser beam
It is 3 to 10mm；The lower end surface of the protection gas hood and the distance range of welding point are 5 to 15mm.
10. according to the method described in claim 8, it is characterized by: the range of the preset height be 0 to 15mm, welding
The fluctuation range of Cheng Zhong, the laser power for making the fluctuation range of the preset height be less than 1mm, and provide the laser welding head are small
In 10W.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611230271.1A CN107052576B (en) | 2016-12-27 | 2016-12-27 | Method of the runner cavity without splashing high power laser light penetration weld |
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| CN109128505A (en) * | 2018-10-08 | 2019-01-04 | 吉林大学 | Austenitic stainless steel rail passenger car body side wall method for laser welding |
| US20220055148A1 (en) * | 2020-08-19 | 2022-02-24 | Transportation Ip Holdings, Llc | Welding window device |
| CN117840590B (en) * | 2024-03-07 | 2024-06-04 | 成都天成电科科技有限公司 | Method for protecting inner cavity chip during laser re-welding and laser re-welding system |
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| JPS5592298A (en) * | 1979-01-06 | 1980-07-12 | Sumitomo Metal Ind Ltd | Gas pressure control method of welding gas backing |
| CN101890558A (en) * | 2010-07-07 | 2010-11-24 | 昆山华恒工程技术中心有限公司 | Automatically backing weld method of pipeline MAG |
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