CN106884087B - A kind of laser impact intensified deformation control method of stainless steel welded joint - Google Patents
A kind of laser impact intensified deformation control method of stainless steel welded joint Download PDFInfo
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- CN106884087B CN106884087B CN201710060472.XA CN201710060472A CN106884087B CN 106884087 B CN106884087 B CN 106884087B CN 201710060472 A CN201710060472 A CN 201710060472A CN 106884087 B CN106884087 B CN 106884087B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Abstract
A kind of laser impact intensified deformation control method of stainless steel welded joint, it is designed by gradient laser energy, the welding region big to residual tension uses high laser energy, the heat affected area small to residual stress and matrix area use low laser energy, gradient energy is selected for transitional region, so that the stress distribution of the weld metal zone of welding point, heat affected area and matrix area is more uniform, single energy is avoided to impact so that the stress distribution of welding point different zones is in the problems in ladder distribution and stress collection.When to weld metal zone laser-impact, laser facula is moved along weld width, harmful stress is moved to welding point with exterior domain, the mechanical property of welding point is not influenced, further increase the comprehensive performance of material, have the characteristics that treatment effeciency is high, be capable of handling the reluctant position of traditional intensifying method and the type face of complexity, so that welding different zones surface stress distribution reaches unanimity.
Description
Technical field
The present invention relates to laser surface processing fields, and in particular to a kind of laser impact intensified deformation of stainless steel welded joint
Control method.
Background technique
With the continuous upgrading of Aerospace Products, the structure type of component is more various, this processing to material
More stringent requirements are proposed for manufacture, in order to improve bearing capacity and high-performance, mitigate weight, is connected by the way of welding
It connects, is currently widely used mode.
Austenitic stainless steel has good plasticity and toughness because its is as-welded；When stiffness of structural member is less big, it is not likely to produce
Weld crack, welding performance are excellent.But main problem is to generate the deformation more much bigger than mild steel when it is welded.Excessive welding
Deformation not only influences product size precision and appearance, but also can reduce its bearing capacity, shortens the working life, and corrects deformation,
It takes a lot of work, improve cost again, can also cause some new problems in correction or after correction.Therefore the size of component post welding distortion,
Superiority and inferiority, difficulty or ease, the production efficiency of degree of constructing etc. for seriously affecting part quality, understand the reason of generating welding deformation, take
Corresponding control measure achieve the purpose that prevent or reduce welding deformation, have a very important significance.
Laser impact intensified is a kind of novel surface reinforcement technique to grow up nearest decades.It utilizes high power arteries and veins
Impulse photoinduction generates plasma stock wave and acts on metal material, can not only form the remnants of hundreds of MPa on part surface layer
Compression, and part surface hardness can be improved and make surface grain refinement, to significantly improve the anti-of stainless steel welded part
Fatigability wear-resisting undermines anti-stress corrosion performance.Residual compressive stress can be formed using the stainless steel welded part of laser-impact and improve it
Anti-stress corrosion performance, but the stress distribution unevenness formed for thin Member Welding process leads to joint distortion and laser-impact mistake
The problem on deformation that journey and welding point mechanism occur, seriously constrains laser impact intensified answering on stainless steel welded part
With.
Summary of the invention
For the problem on deformation for overcoming stainless steel welded part existing in the prior art, the invention proposes a kind of welderings of stainless steel
The laser impact intensified deformation control method of connector.
Detailed process of the invention is:
Step 1, determine different laser impact intensified deformed areas: forming Seam and heat effected zone according to welding process will weld
The laser impact intensified deformed region of connector is divided into weld metal zone and weld seam exterior domain.Weldering is divided into the weld seam exterior domain again
Transition region, heat affected area and matrix area between seam and heat affected area.The weld seam exterior domain includes the region of the weld seam two sides.
Step 2, determine laser-impact path: the laser-impact includes rushing for impact to weld seam and weld seam exterior domain
It hits.Identified laser-impact path is respectively:
Determine the laser-impact path of weld metal zone.Identified laser-impact path is the movement routine of hot spot；Hot spot
Movement routine be along the serpentine path of weld metal zone width direction.
The laser-impact path of determining weld metal zone is: hot spot is using weld seam end surface side as starting point, along the weldering
The width direction for stitching area is mobile.When hot spot is moved to weld metal zone surface other side edge, the movement routine and weldering of hot spot
The direction of seam is in parallel to the diameter of mobile half of the hot spot in the lower section of the weld metal zone.Then, the hot spot is anti-along the width of the weld seam
Direction is moved to the lower section of the hot spot starting point；Hot spot continues mobile partly to the lower section of the weld seam with the path parallel with bead direction
The diameter of a hot spot.It repeats the above process, until hot spot is moved to the other end of the weld seam.
Determine the laser-impact path of weld seam exterior domain.Identified laser-impact path is the movement routine of hot spot；
The movement routine of hot spot is along the length direction serpentine path of weld seam.
The laser-impact path of identified weld seam exterior domain is: hot spot is with the side of one end outside the weld metal zone
Point moves along the length direction of the weld seam close to the weld seam area edge, and keeps hot spot parallel with the direction of the weld seam.When hot spot moves
When moving to the weld seam area edge other end, the movement routine of hot spot moves half to the outside in parallel along the width direction of the weld seam
The diameter of a hot spot.Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam；Hot spot continues
Width direction along weld seam is to the diameter for moving half of hot spot on the outside of the weld metal zone.
Step 3, it determines gradient laser energy: determining laser energy according to welding point different zones.
The laser energy of weld metal zone selects 0.7J~6J, and the transition region selection 0.6 between weld metal zone and heat affected area~
5.5J energy impact, heat affected area select 0.5~5J energy impact, between heat affected area and matrix transition region using 0.4~
The laser energy of 4.5J, from weld metal zone to matrix, laser energy successively successively decreases the energy of laser.
Step 4, the selection of hot spot parameter: laser spot diameter 1mm~3mm, the integer of the number of spots on weld metal zone
Again it is the width dimensions of weld seam, and meet selected spot diameter to make weld metal zone laser power density≤5GW/cm2, hot spot
Overlapping rate is 50%.
Step 5, laser-impact: according to identified laser-impact path, using ps pulsed laser and ns pulsed laser respectively to weld metal zone
Laser-impact is successively carried out with weld seam exterior domain, is completed to the laser impact intensified deformation of the first time of stainless steel welded joint.
When laser-impact weld metal zone, hot spot is mobile by determining serpentine movement routine.When mobile, hot spot is with the weld seam
Area end surface side is starting point, and the width direction along the weld seam moves, and keeps hot spot orthogonal with the direction of the weld seam.Work as hot spot
When being moved to the face of weld other side edge, the movement routine of hot spot and the direction of weld seam are parallel to the shifting of the lower section of the weld seam
The diameter of dynamic half of hot spot.Then, which is moved to the lower section of the hot spot starting point along the width opposite direction of the weld seam；Hot spot
Continue the diameter with the path parallel with bead direction to mobile half of the hot spot in the lower section of the weld seam.Hot spot is on the move, every shifting
The diameter of dynamic half of hot spot carries out one-shot to face of weld, makes the overlapping rate 50% between adjacent hot spot.It repeats
The above process completes the laser-impact to weld metal zone until hot spot is moved to the other end of the weld metal zone.
When laser-impact weld seam exterior domain, any side outside mobile spot to weld metal zone.Length of the mobile spot along weld seam
Direction carries out laser-impact.Laser-impact weld seam exterior domain: any side outside mobile spot to weld metal zone.Mobile spot is along weld seam
Length direction carry out laser-impact.When impact, hot spot is mobile by determining serpentine movement routine.When mobile, hot spot is with described
The side of one end is starting point outside weld metal zone, is moved close to the weld seam area edge along the length direction of the weld seam, and makes hot spot and be somebody's turn to do
The direction of weld seam is parallel.Using 1~2 row's hot spot of 0.6J~5.5J impinging laser energy, the movement routine of hot spot and the length of weld seam
It is parallel to spend direction.When hot spot is moved to the weld seam area edge other end, the movement routine of hot spot is along the width side of the weld seam
To in parallel to the diameter of mobile half of the hot spot in the outside.Then, which is moved to the light along the length opposite direction of the weld seam
The outside of spot starting point, using 0.5~5J laser energy, length direction of the hot spot close to the edge of transition region along weld seam is moved, and is pressed
The heat affected area of the mobile percussion weld of serpentine movement routine, until hot spot is moved to heat affected area edge and reaches matrix area, hot spot
Continue the width direction along weld seam to the diameter for moving half of hot spot on the outside of the weld seam, using 0.4~4.5J laser energy edge
The length direction of weld seam impacts 1~3 row's hot spot.Complete the impact to a side region outside the weld seam.
When mobile, hot spot is using the side of one end outside the weld metal zone as starting point, close to the weld edge along the length of the weld seam
It is mobile to spend direction, and keeps hot spot parallel with the direction of the weld seam.When hot spot is moved to the weld edge other end, hot spot
Movement routine moves the diameter of half of hot spot along the width direction of the weld seam to the outside in parallel.Then, the hot spot is along the weldering
The length opposite direction of seam is moved to the outside of the hot spot starting point；Hot spot continue along weld seam outer sidesway from width direction to the weld seam
The diameter of dynamic half of hot spot.It repeats the above process, until hot spot is moved to 5~10mm other than the side of weld metal zone, completes to the weldering
Stitch the impact of an outer side region.
Hot spot is on the move, and the diameter of half of hot spot of every movement carries out one-shot to weld seam exterior domain surface, makes phase
Overlapping rate between adjacent hot spot is 50%.Complete the laser-impact to side weld metal zone surface first time.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld seam, along weld seam
Length direction carry out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot institute as above
It states, until completing the impact to the weld seam side region, that is, completes the first time laser-impact to another side weld exterior domain.
Transition region between the weld metal zone and heat affected area is the range where the 1st~2 row's hot spot of weld seam exterior domain；
The matrix area of the close heat affected area is the range in weld seam exterior domain where outermost 1~3 row hot spot.
Step 6, repeated impacts: according to selected laser energy, hot spot parameter and path, step 5 is repeated, test specimen is carried out
1~2 laser impact intensified processing.Complete the laser impact intensified deformation to stainless steel welded joint.
The present invention is in the laser impact intensified deformation of stainless steel welded joint by reasonably selecting laser-impact path, ladder
Laser energy and hot spot parameter are spent, the control of Welded Joints deformation is realized, so that stainless steel welded joint different zones surface
It produces residual compressive stress to reach unanimity, does not form residual tension.
Compared with prior art, the invention has the following advantages:
It is designed by gradient laser energy, the welding region big to residual tension uses high laser energy, to remnants
The small heat affected area of stress and matrix area use low laser energy, select gradient energy for transitional region, so that weldering
The stress distribution of the weld metal zone of connector, heat affected area and matrix area is more uniform, avoids single energy impact so that connecing
The stress distribution of head different zones is unable to control deformation, while reducing the property of material in the problems in ladder distribution and stress collection
Energy.
At laser-impact weld metal zone, laser facula is moved along weld width, rather than is moved along fusion length direction, will be had
Evil stress is moved to welding point with exterior domain, does not influence the mechanical property of welding point, keeps the comprehensive performance of material further
It improves, this method treatment effeciency is high, can handle the type at the reluctant position of traditional intensifying method (turning, hole etc.) and complexity
Face, so that welding different zones surface stress distribution reaches unanimity.
By taking 316L welding point as an example.Test proves that surface residual tensile stress becomes gradient to the welding point after processing
Residual compressive stress less than -10Mpa.
Detailed description of the invention
Fig. 1 is laser-impact path schematic diagram.
Fig. 2 is flow chart of the invention.In figure:
1. weld metal zone；2. hot spot；3. path；4. the transition region between weld seam and heat affected area；5. heat affected area；6. matrix
Area；7. weld seam exterior domain.
Specific embodiment
Embodiment 1
Present embodiments provide a kind of laser impact intensified deformation control method of stainless steel welded joint.Tested welding
Joint test piece is 316L stainless steel welded joint.
The detailed process of the present embodiment is:
Step 1, determine different laser impact intensified deformed areas: forming Seam and heat effected zone according to welding process will weld
The laser impact intensified deformed region of connector is divided into weld metal zone 1 and weld seam exterior domain 7.It is divided again in the weld seam exterior domain 7
Transition region 4, heat affected area 5 and matrix area 6 between weld seam and heat affected area.The weld seam exterior domain includes the weld seam two sides
Region.
Step 2, determine laser-impact path: the laser-impact includes the impact and weld seam exterior domain to weld metal zone
Impact.Identified laser-impact path is respectively:
Determine the laser-impact path of weld metal zone.Identified laser-impact path is the movement routine of hot spot；Hot spot
Movement routine be serpentine.When mobile, hot spot is using weld seam end surface side as starting point, along the width direction of the weld seam
It is mobile.When hot spot is moved to weld metal zone surface other side edge, the movement routine of hot spot and the direction of weld seam it is parallel to
The diameter of mobile half of the hot spot in the lower section of the weld seam.Then, which is moved to the hot spot along the width opposite direction of the weld seam
The lower section of starting point；Hot spot continues the diameter with the path parallel with bead direction to mobile half of the hot spot in the lower section of the weld seam.Weight
The multiple above process, until hot spot is moved to the other end of the weld seam.
Determine the laser-impact path of weld seam exterior domain.Identified laser-impact path is the movement routine of hot spot；
The movement routine of hot spot is serpentine.
In laser-impact, any side outside mobile spot to weld metal zone.Mobile spot is carried out along the length direction of weld seam
Laser-impact.When mobile, hot spot is using the side of one end outside the weld metal zone as starting point, close to the weld seam area edge along the weld seam
Length direction is mobile, and keeps hot spot parallel with the direction of the weld seam.When hot spot is moved to the weld seam area edge other end, light
The movement routine of spot moves the diameter of half of hot spot along the width direction of the weld seam to the outside in parallel.Then, the hot spot is along institute
The length opposite direction for stating weld seam is moved to the outside of the hot spot starting point；Hot spot continues the width direction along weld seam to outside the weld seam
The diameter of mobile half of the hot spot in side.It repeats the above process, until hot spot is moved to 8mm other than the side of weld metal zone, completes to the weldering
Stitch the impact of an outer side region.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld seam, along weld seam
Length direction carry out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot institute as above
It states.
Step 3, determine gradient laser energy: weld metal zone laser energy selects 3J, the mistake between weld metal zone and heat affected area
Area's selection 2.5J energy impact is crossed, heat affected area selects 2J energy impact, and matrix area uses the laser energy of 1.5J, the energy of laser
From weld metal zone to matrix, laser energy successively successively decreases amount.
Step 4, the selection of hot spot parameter: the integral multiple of laser spot diameter 2mm, the number of spots on weld metal zone are rigid
Well it is the width dimensions of weld seam, and meet selected spot diameter to make weld metal zone laser power density≤5GW/cm2, hot spot
Overlapping rate is 50%.
Step 5, laser-impact: according to identified laser-impact path, respectively successively to weld metal zone and weld seam exterior domain
Carry out laser-impact.
Laser-impact weld metal zone: the weld metal zone is impacted using ps pulsed laser and ns pulsed laser.When impact, hot spot is by determination
Serpentine movement routine it is mobile.When mobile, hot spot is using weld seam end surface side as starting point, along the width side of the weld seam
To movement, and keep hot spot orthogonal with the direction of the weld seam.When hot spot is moved to weld metal zone surface other side edge, hot spot
The movement routine diameter to mobile half of the hot spot in the lower section of the weld seam parallel with the direction of weld seam.Then, the hot spot is described in
The width opposite direction of weld seam is moved to the lower section of the hot spot starting point；Hot spot continues with the path parallel with bead direction to the weld seam
Mobile half of the hot spot in lower section diameter.It repeats the above process, until hot spot is moved to the other end of the weld seam, completes to weld seam
The laser-impact in area.
Laser-impact weld seam exterior domain: any side outside mobile spot to weld metal zone.Mobile spot is along the length side of weld seam
To progress laser-impact.When impact, hot spot is mobile by determining serpentine movement routine.When mobile, hot spot with the weld metal zone outside
The side of one end is starting point, is moved close to the weld seam area edge along the length direction of the weld seam, and make the side of hot spot Yu the weld seam
To parallel.Using 1 row's hot spot of 2.5J impinging laser energy, the movement routine of hot spot and the length direction of weld seam are parallel.Work as hot spot
When being moved to the weld seam area edge other end, the movement routine of hot spot is moved to the outside in parallel along the width direction of the weld seam
The diameter of half of hot spot.Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam, using 2J
Laser energy, length direction of the hot spot close to the edge of transition region along weld seam move, by the mobile percussion weld of serpentine movement routine
Heat affected area, until hot spot be moved to heat affected area edge reach matrix area, hot spot continue along weld seam width direction to this
The diameter of mobile half of the hot spot in the outside of weld seam impacts two rows of hot spots along the length direction of weld seam using 1.5J laser energy.It is complete
The impact of the pairs of outer side region of the weld seam.
Hot spot is on the move, and the diameter of half of hot spot of every movement carries out one-shot to weld metal zone surface, makes adjacent
Overlapping rate between hot spot is 50%.Complete the laser-impact to weld metal zone surface.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld metal zone, along weldering
The length direction of seam carries out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot is as above
It is described, until completing the impact to the weld seam side region, that is, complete the laser-impact to weld seam exterior domain.
So far, it completes to the laser impact intensified deformation of the first time of stainless steel welded joint.
Step 6, repeated impacts: according to selected laser energy, hot spot parameter and path, step 5 is repeated, test specimen is carried out
2nd laser impact intensified processing.Complete the laser impact intensified deformation to stainless steel welded joint.
The residual tension of 316L stainless steel welded joint becomes residual compressive stress after the present embodiment is laser impact intensified, welds
It is consistent to connect different zones stress area, deformation is controlled.
Embodiment 2
Present embodiments provide a kind of laser impact intensified deformation control method of stainless steel welded joint.Tested welding
Joint test piece is 304 stainless steel welded joints.
The detailed process of the present embodiment is:
Step 1, determine different laser impact intensified deformed areas: forming Seam and heat effected zone according to welding process will weld
The laser impact intensified deformed region of connector is divided into weld metal zone 1 and weld seam exterior domain 7.It is divided again in the weld seam exterior domain 7
Transition region 4, heat affected area 5 and matrix area 6 between weld seam and heat affected area.The weld seam exterior domain includes the weld seam two sides
Region.
Step 2, determine laser-impact path: the laser-impact includes the impact and weld seam exterior domain to weld metal zone
Impact.Identified laser-impact path is respectively:
Determine the laser-impact path of weld metal zone.Identified laser-impact path is the movement routine of hot spot；Hot spot
Movement routine be serpentine.When mobile, hot spot is using weld seam end surface side as starting point, along the width direction of the weld seam
It is mobile.When hot spot is moved to weld metal zone surface other side edge, the movement routine of hot spot and the direction of weld seam it is parallel to
The diameter of mobile half of the hot spot in the lower section of the weld seam.Then, which is moved to the hot spot along the width opposite direction of the weld seam
The lower section of starting point；Hot spot continues the diameter with the path parallel with bead direction to mobile half of the hot spot in the lower section of the weld seam.Weight
The multiple above process, until hot spot is moved to the other end of the weld seam.
Determine the laser-impact path of weld seam exterior domain.Identified laser-impact path is the movement routine of hot spot；
The movement routine of hot spot is serpentine.
In laser-impact, any side outside mobile spot to weld metal zone.Mobile spot is carried out along the length direction of weld seam
Laser-impact.When mobile, hot spot is using the side of one end outside the weld metal zone as starting point, close to the weld seam area edge along the weld seam
Length direction is mobile, and keeps hot spot parallel with the direction of the weld seam.When hot spot is moved to the weld seam area edge other end, light
The movement routine of spot moves the diameter of half of hot spot along the width direction of the weld seam to the outside in parallel.Then, the hot spot is along institute
The length opposite direction for stating weld seam is moved to the outside of the hot spot starting point；Hot spot continues the width direction along weld seam to outside the weld seam
The diameter of mobile half of the hot spot in side.It repeats the above process, until hot spot is moved to 10mm other than the side of weld metal zone, completes to the weldering
Stitch the impact of an outer side region.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld seam, along weld seam
Length direction carry out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot institute as above
It states.
Step 3, determine gradient laser energy: weld metal zone laser energy selects 6J, the mistake between weld metal zone and heat affected area
Area's selection 5.5J energy impact is crossed, heat affected area selects 5J energy impact, and matrix area uses the laser energy of 4.5J, the energy of laser
From weld metal zone to matrix, laser energy successively successively decreases amount.
Step 4, the selection of hot spot parameter: the integral multiple of laser spot diameter 3mm, the number of spots on weld metal zone are rigid
Well it is the width dimensions of weld seam, and meet selected spot diameter to make weld metal zone laser power density≤5GW/cm2, hot spot
Overlapping rate is 50%.
Step 5, laser-impact: according to identified laser-impact path, respectively successively to weld metal zone and weld seam exterior domain
Carry out laser-impact.
Laser-impact weld metal zone: the weld metal zone is impacted using ps pulsed laser and ns pulsed laser.When impact, hot spot is by determination
Serpentine movement routine it is mobile.When mobile, hot spot is using weld seam end surface side as starting point, along the width side of the weld seam
To movement, and keep hot spot orthogonal with the direction of the weld seam.When hot spot is moved to weld metal zone surface other side edge, hot spot
The movement routine diameter to mobile half of the hot spot in the lower section of the weld seam parallel with the direction of weld seam.Then, the hot spot is described in
The width opposite direction of weld seam is moved to the lower section of the hot spot starting point；Hot spot continues with the path parallel with bead direction to the weld seam
Mobile half of the hot spot in lower section diameter.It repeats the above process, until hot spot is moved to the other end of the weld seam, completes to weld seam
The laser-impact in area.
Laser-impact weld seam exterior domain: any side outside mobile spot to weld metal zone.Mobile spot is along the length side of weld seam
To progress laser-impact.When impact, hot spot is mobile by determining serpentine movement routine.When mobile, hot spot with the weld metal zone outside
The side of one end is starting point, is moved close to the weld seam area edge along the length direction of the weld seam, and make the side of hot spot Yu the weld seam
To parallel.Using one row's hot spot of 5.5J impinging laser energy, the movement routine of hot spot and the length direction of weld seam are parallel.Work as hot spot
When being moved to the weld seam area edge other end, the movement routine of hot spot is moved to the outside in parallel along the width direction of the weld seam
The diameter of half of hot spot.Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam, using 5J
Laser energy, length direction of the hot spot close to the edge of transition region along weld seam move, by the mobile percussion weld of serpentine movement routine
Heat affected area, until hot spot be moved to heat affected area edge reach matrix area, hot spot continue along weld seam width direction to this
The diameter of mobile half of the hot spot in the outside of weld seam, the length direction using 4.5J laser energy along weld seam impact 1 row's hot spot.It completes
Impact to a side region outside the weld seam.
Hot spot is on the move, and the diameter of half of hot spot of every movement carries out one-shot to weld metal zone surface, makes adjacent
Overlapping rate between hot spot is 50%.Complete the laser-impact to weld metal zone surface.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld metal zone, along weldering
The length direction of seam carries out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot is as above
It is described, until completing the impact to the weld seam side region, that is, complete the laser-impact to weld seam exterior domain.
So far, it completes to the laser impact intensified deformation of the first time of stainless steel welded joint.
Step 6, repeated impacts: according to selected laser energy, hot spot parameter and path, step 5 is repeated, test specimen is carried out
2 laser impact intensified processing.Complete the laser impact intensified deformation to stainless steel welded joint.
The residual tension of 304 stainless steel welded joints after the present embodiment is laser impact intensified becomes residual pressure and answers
Power, welding different zones stress area is consistent, and residual tension reaches -100Mpa or so, and deformation is controlled.
Embodiment 3
Present embodiments provide a kind of laser impact intensified deformation control method of stainless steel welded joint.In the present embodiment
Test specimen is 347 stainless steel welded joints.
Step 1, determine different laser impact intensified deformed areas: forming Seam and heat effected zone according to welding process will weld
The laser impact intensified deformed region of connector is divided into weld metal zone 1 and weld seam exterior domain 7.It is divided again in the weld seam exterior domain 7
Transition region 4, heat affected area 5 and matrix area 6 between weld seam and heat affected area.The weld seam exterior domain includes the weld seam two sides
Region.
Step 2, determine laser-impact path: the laser-impact includes the impact and weld seam exterior domain to weld metal zone
Impact.Identified laser-impact path is respectively:
Determine the laser-impact path of weld metal zone.Identified laser-impact path is the movement routine of hot spot；Hot spot
Movement routine be serpentine.When mobile, hot spot is using weld seam end surface side as starting point, along the width direction of the weld seam
It is mobile.When hot spot is moved to weld metal zone surface other side edge, the movement routine of hot spot and the direction of weld seam it is parallel to
The diameter of mobile half of the hot spot in the lower section of the weld seam.Then, which is moved to the hot spot along the width opposite direction of the weld seam
The lower section of starting point；Hot spot continues the diameter with the path parallel with bead direction to mobile half of the hot spot in the lower section of the weld seam.Weight
The multiple above process, until hot spot is moved to the other end of the weld seam.
Determine the laser-impact path of weld seam exterior domain.Identified laser-impact path is the movement routine of hot spot；
The movement routine of hot spot is serpentine.
In laser-impact, any side outside mobile spot to weld metal zone.Mobile spot is carried out along the length direction of weld seam
Laser-impact.When mobile, hot spot is using the side of one end outside the weld metal zone as starting point, close to the weld seam area edge along the weld seam
Length direction is mobile, and keeps hot spot parallel with the direction of the weld seam.When hot spot is moved to the weld seam area edge other end, light
The movement routine of spot moves the diameter of half of hot spot along the width direction of the weld seam to the outside in parallel.Then, the hot spot is along institute
The length opposite direction for stating weld seam is moved to the outside of the hot spot starting point；Hot spot continues the width direction along weld seam to outside the weld seam
The diameter of mobile half of the hot spot in side.It repeats the above process, until hot spot is moved to 5mm other than the side of weld metal zone, completes to the weldering
Stitch the impact of an outer side region.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld seam, along weld seam
Length direction carry out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot institute as above
It states.
Step 3, determine gradient laser energy: weld metal zone laser energy selects 0.7J, between weld metal zone and heat affected area
Transition region selects 0.6J energy impact, and heat affected area selects 0.5J energy impact, and matrix area uses the laser energy of 0.4J, laser
Energy from weld metal zone to matrix, laser energy successively successively decreases.
Step 4, the selection of hot spot parameter: the integral multiple of laser spot diameter 1mm, the number of spots on weld metal zone are rigid
Well it is the width dimensions of weld seam, and meet selected spot diameter to make weld metal zone laser power density≤5GW/cm2, hot spot
Overlapping rate is 50%.
Step 5, laser-impact: according to identified laser-impact path, respectively successively to weld metal zone and weld seam exterior domain
Carry out laser-impact.
Laser-impact weld metal zone: the weld metal zone is impacted using ps pulsed laser and ns pulsed laser.When impact, hot spot is by determination
Serpentine movement routine it is mobile.When mobile, hot spot is using weld seam end surface side as starting point, along the width side of the weld seam
To movement, and keep hot spot orthogonal with the direction of the weld seam.When hot spot is moved to weld metal zone surface other side edge, hot spot
The movement routine diameter to mobile half of the hot spot in the lower section of the weld seam parallel with the direction of weld seam.Then, the hot spot is described in
The width opposite direction of weld seam is moved to the lower section of the hot spot starting point；Hot spot continues with the path parallel with bead direction to the weld seam
Mobile half of the hot spot in lower section diameter.It repeats the above process, until hot spot is moved to the other end of the weld seam, completes to weld seam
The laser-impact in area.
Laser-impact weld seam exterior domain: any side outside mobile spot to weld metal zone.Mobile spot is along the length side of weld seam
To progress laser-impact.When impact, hot spot is mobile by determining serpentine movement routine.When mobile, hot spot with the weld metal zone outside
The side of one end is starting point, is moved close to the weld seam area edge along the length direction of the weld seam, and make the side of hot spot Yu the weld seam
To parallel.Using three row's hot spot of 0.6J impinging laser energy, the movement routine of hot spot and the length direction of weld seam are parallel.Work as hot spot
When being moved to the weld seam area edge other end, the movement routine of hot spot is moved to the outside in parallel along the width direction of the weld seam
The diameter of half of hot spot.Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam, uses
0.5J laser energy, length direction of the hot spot close to the edge of transition region along weld seam move, and impact by serpentine movement routine is mobile
The heat affected area of weld seam, until hot spot is moved to heat affected area edge and reaches matrix area, hot spot continues the width direction along weld seam
To the diameter of mobile half of the hot spot in the outside of the weld seam, the length direction using 0.4J laser energy along weld seam impacts 3 row's hot spots.
Complete the impact to a side region outside the weld seam.
Hot spot is on the move, and the diameter of half of hot spot of every movement carries out one-shot to weld metal zone surface, makes adjacent
Overlapping rate between hot spot is 50%.Complete the laser-impact to weld metal zone surface.
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld metal zone, along weldering
The length direction of seam carries out laser-impact.When another side region is impacted outside to the weld seam, the movement routine of hot spot is as above
It is described, until completing the impact to the weld seam side region, that is, complete the laser-impact to weld seam exterior domain.
So far, it completes to the laser impact intensified deformation of the first time of stainless steel welded joint.
Step 6, repeated impacts: according to selected laser energy, hot spot parameter and path, step 5 is repeated, test specimen is carried out
2nd laser impact intensified processing.Complete the laser impact intensified deformation to stainless steel welded joint.
The residual tension of 347 stainless steel welded joints after the present embodiment is laser impact intensified becomes residual pressure and answers
Power, welding different zones stress area is consistent, is greater than -150Mpa, and deformation is controlled.
Claims (5)
1. a kind of laser impact intensified deformation control method of stainless steel welded joint, which is characterized in that detailed process is:
Step 1, it determines different laser impact intensified deformed areas: Seam and heat effected zone being formed according to welding process and connects welding
Laser impact intensified deformed region is divided into weld metal zone and weld seam exterior domain；In the weld seam exterior domain again be divided into weld seam with
Transition region, heat affected area and matrix area between heat affected area；The weld seam exterior domain includes the region of the weld seam two sides；It is described
Transition region between weld metal zone and heat affected area is that the 1-2 of weld seam exterior domain arranges the range where hot spot；Close to heat affected area
Matrix area be heat affected area 1-3 arrange hot spot where range；
Step 2, determine laser-impact path: the laser-impact includes the impact of the impact and weld seam exterior domain to weld seam；
Identified laser-impact path is respectively:
Determine the laser-impact path of weld metal zone；Identified laser-impact path is the movement routine of hot spot；The shifting of hot spot
Dynamic path is the serpentine along weld metal zone width direction；
Determine the laser-impact path of weld seam exterior domain；Identified laser-impact path is the movement routine of hot spot；Hot spot
Movement routine be along fusion length direction serpentine；
Step 3, it determines gradient laser energy: determining laser energy according to welding point different zones；
The laser energy of weld metal zone selects 0.7J~6J, and the transition region between weld metal zone and heat affected area selects 0.6~5.5J energy
Stroke, heat affected area select 0.5~5J energy impact, transition region swashing using 0.4~4.5J between heat affected area and matrix
Light energy, from weld metal zone to matrix, laser energy successively successively decreases the energy of laser；
Step 4, the selection of hot spot parameter: the integral multiple of laser spot diameter 1mm~3mm, the number of spots on weld metal zone is
The width dimensions of weld seam, and spot diameter selected by satisfaction will make weld metal zone laser power density≤5GW/cm2, the overlap joint of hot spot
Rate is 50%；
Step 5, laser-impact: according to identified laser-impact path, using ps pulsed laser and ns pulsed laser respectively to weld metal zone and weldering
Seam exterior domain successively carries out laser-impact, completes to the laser impact intensified deformation of the first time of stainless steel welded joint；
Step 6, repeated impacts: according to selected laser energy, hot spot parameter and path, repeating step 5, carries out 1~2 to test specimen
Secondary laser impact intensified processing；Complete the laser impact intensified deformation to stainless steel welded joint.
2. the laser impact intensified deformation control method of stainless steel welded joint as described in claim 1, which is characterized in that step 2
In the laser-impact path of identified weld metal zone be: hot spot is using weld seam end surface side as starting point, along the weld metal zone
Width direction it is mobile；When hot spot is moved to weld metal zone surface other side edge, the movement routine of hot spot and weld seam
Direction is in parallel to the diameter of mobile half of the hot spot in the lower section of the weld metal zone；Then, width opposite direction of the hot spot along the weld seam
It is moved to the lower section of the hot spot starting point；Hot spot continues to move half of light to the lower section of the weld seam with the path parallel with bead direction
The diameter of spot；It repeats the above process, until hot spot is moved to the other end of the weld seam.
3. the laser impact intensified deformation control method of stainless steel welded joint as described in claim 1, which is characterized in that step 2
In the laser-impact path of identified weld seam exterior domain be: hot spot using the side of one end outside the weld metal zone as starting point, close to
The weld seam area edge is moved along the length direction of the weld seam, and keeps hot spot parallel with the direction of the weld seam；When hot spot is moved to institute
When stating the weld seam area edge other end, the movement routine of hot spot moves half of hot spot to the outside in parallel along the width direction of the weld seam
Diameter；Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam；Hot spot continues along weld seam
Diameter from width direction to mobile half of the hot spot in the outside of the weld metal zone.
4. the laser impact intensified deformation control method of stainless steel welded joint as described in claim 1, which is characterized in that laser punching
When hitting weld metal zone, hot spot is mobile by determining serpentine movement routine；When mobile, hot spot is with weld metal zone end surface side
For starting point, the width direction along the weld seam is moved, and keeps hot spot orthogonal with the direction of the weld seam；When hot spot is moved to the weld seam
When the edge of the surface other side, the movement routine of hot spot and the direction of weld seam are parallel to the straight of mobile half of the hot spot in the lower section of the weld seam
Diameter；Then, which is moved to the lower section of the hot spot starting point along the width opposite direction of the weld seam；Hot spot continue with weld seam side
To parallel path to the diameter of mobile half of the hot spot in the lower section of the weld seam；The diameter of half of hot spot of every movement is i.e. to face of weld
One-shot is carried out, the overlapping rate 50% between adjacent hot spot is made；It repeats the above process, until hot spot is moved to the weld seam
The other end in area completes the laser-impact to weld metal zone.
5. the laser impact intensified deformation control method of stainless steel welded joint as described in claim 1, which is characterized in that laser punching
When hitting weld seam exterior domain, any side outside mobile spot to weld metal zone；Mobile spot carries out laser punching along the length direction of weld seam
It hits；Laser-impact weld seam exterior domain: any side outside mobile spot to weld metal zone；Mobile spot is carried out along the length direction of weld seam
Laser-impact；When impact, hot spot is mobile by determining serpentine movement routine；When mobile, hot spot is with one end outside the weld metal zone
Side is starting point, is moved close to the weld seam area edge along the length direction of the weld seam, and keep hot spot parallel with the direction of the weld seam；
Using 1~2 row's hot spot of 0.6J~5.5J impinging laser energy, the movement routine of hot spot and the length direction of weld seam are parallel；Work as light
When spot is moved to the weld seam area edge other end, the movement routine of hot spot along the weld seam width direction in parallel to the outer sidesway
The diameter of dynamic half of hot spot；Then, which is moved to the outside of the hot spot starting point along the length opposite direction of the weld seam, uses
0.5~5J laser energy, length direction of the hot spot close to the edge of transition region along weld seam move, mobile by serpentine movement routine
The heat affected area of percussion weld, until hot spot is moved to heat affected area edge and reaches matrix area, hot spot continues the width along weld seam
The diameter of half of hot spot is moved in direction to the outside of the weld seam, and the length direction using 0.4~4.5J laser energy along weld seam rushes
Hit 1~3 row's hot spot；Complete the impact to a side region outside the weld seam；
When mobile, hot spot is using the side of one end outside the weld metal zone as starting point, close to the weld edge along the length side of the weld seam
To movement, and keep hot spot parallel with the direction of the weld seam；When hot spot is moved to the weld edge other end, the movement of hot spot
Move the diameter of half of hot spot to the outside in parallel along the width direction of the weld seam in path；Then, the hot spot is along the weld seam
Length opposite direction is moved to the outside of the hot spot starting point；Hot spot continues the width direction along weld seam to moving half on the outside of the weld seam
The diameter of a hot spot；It repeats the above process, until hot spot is moved to 5~10mm other than the side of weld metal zone, completes outside to the weld seam
The impact of one side region；
Hot spot is on the move, and the diameter of half of hot spot of every movement carries out one-shot to weld seam exterior domain surface, makes adjacent
Overlapping rate between hot spot is 50%；Complete the laser-impact to side weld metal zone surface first time；
After completing to the impact of a side region outside the weld seam, another side region outside mobile spot to the weld seam, along the length of weld seam
It spends direction and carries out laser-impact；When another side region is impacted outside to the weld seam, the movement routine of hot spot is as described above, straight
To the impact completed to the weld seam side region, that is, complete the first time laser-impact to another side weld exterior domain.
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