CN105436673A - Automatic welding process for Invar die steel - Google Patents
Automatic welding process for Invar die steel Download PDFInfo
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- CN105436673A CN105436673A CN201510957947.6A CN201510957947A CN105436673A CN 105436673 A CN105436673 A CN 105436673A CN 201510957947 A CN201510957947 A CN 201510957947A CN 105436673 A CN105436673 A CN 105436673A
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- 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
- B23K9/235—Preliminary treatment
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Arc Welding In General (AREA)
Abstract
The invention relates to an automatic welding process for Invar die steel. The process comprises the following steps: selecting welding materials; selecting welding equipment; designing the shape of the bevel of an Invar steel thick sheet welding piece and performing the pre-welding preparation; designing the multi-layer single-channel automatic welding path of an Invar steel thick sheet; designing the parameters of the Invar steel thick sheet multi-layer pulse and oscillation MIG automatic welding process. The pulse MIG arc oscillation welding technology is reasonably adopted, and the large-thickness Invar steel special for manufacturing plane composite dies is welded. For the Invar steel with the thickness of 19.05mm, the welding way of five layers and one welding seam for each layer at the relatively low welding current is adopted to obtain good shaping; staggered fish scales are present on the surface of the welding seam and there is no surface defect such as air pores, splash and cracks on the welding seam, and the back of the Invar steel is completely welded; there is no air pore, crack and impurity in the cross section of the welding seam, the welding seam-base material and the welding seams of the adjacent layers are well welded, there is no obvious grain boundary, the impurities in a weld pool can be effectively purified; after the welding process, the angle deformation is obviously reduced, and the pulse oscillation welding technology has good process adaptability to the Invar steel thick plate.
Description
Technical field:
The present invention relates to a kind of slab automatic soldering technique based on MIG arc welding robot, particularly relate to a kind of automatic soldering technique of Invar mould steel, it belongs to Nickel-based Alloy Welding technical field.
Background technology:
Composite, because of features such as its specific strength are high, fatigue behaviour is good, has become one of stock manufacturing large aircraft, and the technology of preparing of multiple material also becomes one of key technology of the advanced large aircraft of development.The multiple material part of aircraft mainly carries out hot forming in specific mould, the outer mold surface of part is generally no longer carried out machine and is added afterwards, therefore proposes higher requirement to mold materials: thermal coefficient of expansion, alternating temperature and the vacuum stability close with multiple material are good, low cost of manufacture etc.Invar steel, as a kind of nickel-base alloy containing Ni35-36%, have the extremely low thermal coefficient of expansion close with multiple material, and cost is only the 10-30% of other moulds that meet the requirements, and is specially adapted to the mould manufacturing the multiple material part of large scale aircraft.
Welding is in the manufacture of Invar steel large mold one very important process flow process.Be equipped on gas metal-arc welding (MIG weldering) welding method of economy as a kind of relative maturity of high accuracy multi-axis robot; carry out retaining wall on slope before weldering and adopt multilayer multiple tracks filling Strategy, can solve preferably heavy thickness sheet metal connectivity problem.Current the method is used widely in the welding of thick metal, but mainly there is following problem:
● the Invar steel thickness manufactured for multiple timber die is that 19mm is upper and lower, and adopt multi-layer multi-pass welding often to need the weld seam in more than 10 roads to fill, Thermal Cycle repeatedly and the lower thermal conductivity of Invar Steel material itself cause serious post welding distortion;
● nickel-base alloy is poor fluidity in the molten state, and the depth of interaction of conventional MIG electric arc thermal source is limited in addition, easily causes the weld defects such as lack of penetration, incomplete fusion;
● before weldering repeatedly, teaching is exaggerated the error that human factor causes, and the stability of welding quality has a certain impact, and too increases labour intensity simultaneously.
The measure improving thick plates distortion is divided into the front prevention of weldering, corrects with weldering cooling and postwelding.Before weldering prevention comprise default reversible deformation angle, use reliable fixture, welding condition reasonable in design.Spraying, bowssening and water-cooled copper block method is mainly contained with weldering cooling means.Wherein adopt water spray and bowssening cooling effect better, but welding surroundings is poor, requires higher to the hardware controls of cooling system; Water-cooled copper block method radiating effect takes second place, and cost is higher, but welding surroundings is good.Postwelding straightening method mainly contains hammering, shot-peening, local heat treatmet etc.Consider that the orthopedic difficulty of slab postwelding, cost are higher, generally do not pay the utmost attention to.
For the problem that Invar steel penetration is poor, adopt suitably increases thermal weld stress and increases weld penetration more, but limited efficiency and empirical comparatively strong, be unfavorable for transplanting and the standardization of parameter.Compared with pulse MIC arc welding is welded with conventional MIG, larger welding seam deep width ratio can be obtained under the input of lower heat, effectively can improve penetration when Invar steel welds.But also do not have at home directly for the Study and appliance precedent of Invar steel pulse welding, relevant welding condition still locates blank.
When groove size is less, adopt swing path of welding greatly can alleviate the loaded down with trivial details teaching of multi-layer multi-pass welding and welding sequence.During weave bead welding, welding gun swings while advancing, and molten bath is sprawled fully, disposablely can carry out certain thickness filling to wider groove, obtains the weld seam of form stable.At present, the welding robot such as Panasonic, KUKA, ABB or mechanical arm can support various swing welding track, but the production application of this technology is not also promoted at home completely.
In sum, realize heavy thickness Invar steel high-quality, the key of efficient welding designs a set of scientific and rational welding procedure.Under the overall situation that the use proportion that is like a raging fire, composite be particularly in progress at current domestic large Aircraft Project increases day by day, the Invar steel solder technology that research is advanced, formulate ripe technological parameter and flow process, be the important step realizing the production domesticization of Invar steel mold, there is certain strategic importance.
Summary of the invention:
In view of impulse hunting MIG is welded in the superiority in the welding of Invar steel thick plate, present invention process devises the automatic soldering technique of the Invar mould steel of a set of comparatively science, can obtain the Invar steel banjo fixing butt jointing that forming quality is high and stable, post welding distortion is little while enhancing productivity.
The present invention adopts following technical scheme: a kind of automatic soldering technique of Invar mould steel, it comprises the steps:
A) welding material select: the weight content of described Invar mould steel sheet material chemical composition is: Fe63.06%, Ni35.67%, Mn0.49%, Cr0.26%, Si0.24%, Co0.14%, Mo0.13%, welding material used is InvarM93 welding wire, gage of wire 1.2mm, the weight content of welding wire chemical composition is: Fe61.43%, Ni36.20%, Mn0.55%, Al0.54%, Si0.53%, Mo0.53%, Cr0.23%;
B) the selecting of welding equipment: institute's use welding equipment is integral type MIG arc-welding special purpose robot, rated welding current 350A, and speed of welding is 0.01-180m/min;
C) design of Invar mould steel slab weldment bevel shape and welds prepares: described Invar mould steel thickness is 19.05mm; according to the needs of assembling; select single-sided welding forming technology; treat that weldment opens double V-groove; bevel angle is 60 °; root face 1mm; carry out spot welding in welding final position before weldering and prevent transversely deforming; the distortion of reversible deformation clamping pilot angle is adopted before weldering; reversible deformation angle 1.5-2 °, root face spacing 1.5-1.8mm, not preheating; dry extension of electrode is 15mm, and welding process protection adopts 97.5%Ar+2.5%CO
2rich argon atmospher, flow-control at 18-19L/min, postwelding air cooling, interlayer temperature controls below 100 DEG C;
D) Invar mould steel slab multilayer single track automatic welding path planning: described Invar mould steel sheet metal thickness is 19.05mm, designing five layers, every layer adopts single-pass welding to fill, prime coat weld seam is comparatively narrow, adopt straight line path of welding, weld seam Origin And Destination distance two ends are respectively 2-3mm and 4-5mm, the second layer increases gradually to the 4th layer of weld width, and design adopts and swings path of welding;
E) Invar mould steel slab multilayer pulse+swing MIG automatic soldering technique parameter designing: backing welding adopts pulse MIC straight line path of welding, welding current 235-240A, weldingvoltage 26.3-27.3V, speed of welding 0.35-0.4m/min, the second to layer 5 weld seam adopts pulse+simple low speed oscillations path of welding, 3-5 interpolated point is set up, second layer welding current 237-240A, weldingvoltage 27.1-27.3V, speed of welding 0.30-0.32m/min, the long 2.50-2.70mm of amplitude of fluctuation, hunting frequency 1.5-1.6Hz according to fusion length is equidistant; Third layer weld seam welding current 240-242A, voltage 27.3V, speed of welding 0.18-0.21m/min, amplitude of oscillation 4.40-4.60mm, frequency 0.9-1.0Hz; 4th layer of welding current 244-246A, voltage 27.4V, speed of welding 0.16-0.18m/min, amplitude of oscillation 5.90-6.35mm, frequency 0.8-0.9Hz; Layer 5 welding current 245-250A, voltage 27.4-27.6V, speed of welding 0.13-0.15m/min, amplitude of oscillation 7.50-8.40mm, frequency 0.7-0.8Hz.
Compared with existing no pulse MIG multi-pass welding connection technology, the beneficial effect of present invention process is as follows:
Present invention process, by rationally adopting pulse MIC arc oscillation welding connection technology, achieves the welding that the multiple timber die of aircraft manufactures special heavy thickness Invar steel.For the Invar steel that thickness is 19.05mm, under lower welding current, adopt 5 layers, every layer 1 road weld seam can obtain good shaping; Face of weld presents staggered scalelike mark, has no pore, splash and blemish, the back side complete penetration such as crackle; Section of weld joint pore-free, crackle, to be mingled with, weld seam-mother metal and the fusion of adjacent layer weld seam good, have no obvious crystal boundary, in molten bath, impurity is effectively purified; Postwelding angular deformation obviously reduces, and all embodies the Technological adaptability that impulse hunting solder technology is good to Invar steel thick plate.The problems such as present invention process overcomes interlayer lack of fusion that Invar steel adopts traditional no pulse MIG multi-layer multi-pass welding to exist, Forming Quality is unstable, welding deformation is large, provide technology ensuring to raising Invar steel welded joint mechanical property and air-tightness.Meanwhile, present invention process shortens the robot weldering front teaching time, and reduce the uncertainty that artificial sense datum brings, the thick plates for other materials possesses good transplantability and reference.
Accompanying drawing illustrates:
Fig. 1 is the simple swinging track of low speed and major parameter.
Fig. 2 is embodiment 1 each layer of face of weld pattern and welding track.
Fig. 3 is embodiment 1 welding point Cross Section Morphology.
Fig. 4 is embodiment 2 each layers of face of weld pattern.
Detailed description of the invention:
The automatic soldering technique of Invar mould steel of the present invention, comprises the steps:
A) welding material select: the weight content of described Invar steel board chemical composition is after testing: Fe63.06%, Ni35.67%, Mn0.49%, Cr0.26%, Si0.24%, Co0.14%, Mo0.13%, belong to nickel-base alloy, under mother metal room temperature, microscopic appearance is typical austenite structure.Present invention process wlding used is Canadian import InvarM93 welding wire, gage of wire 1.2mm, the weight content of the welding wire chemical composition measured is: Fe61.43%, Ni36.20%, Mn0.55%, Al0.54%, Si0.53%, Mo0.53%, Cr0.23%.Compared to mother metal, with the addition of a small amount of Al in welding wire and slightly add the content of Si, can improve the mobility under Invar molten steel state, the welding wire of high Mn content can improve deoxidizing capacity and the crack healing ability of weld seam in addition.
B) the selecting of welding equipment: the TAWERS-1400 integral type MIG arc-welding special purpose robot that institute's use welding equipment is produced for Tangshan Panasonic, rated welding current 350A, pilot teaching speed is adjustable at 0.01-15m/min, and optional speed of welding is 0.01-180m/min.The built-in welding machine pattern being applicable to the different materials such as carbon steel, stainless steel, aluminium alloy, copper alloy of this welding robot; Optional basic welding track has straight line, camber line, and comprises the wobbling action of 6 types; The switching of pulse and non-pulse current-mode can be carried out.Present invention process adopts stainless steel pattern, and corresponding symbol is Weld1, and welding track is that straight line and straight line+low speed simply swing, and electric current is pulse mode.Welding robot is adopted to weld Invar steel thick plate, can simplification of flowsheet, raise the efficiency, flexible modulation weld heat input, reduce welding residual stress, reduce welding deformation, improve joint performance.
C) design of Invar steel thick plate weldment bevel shape and welds prepares: described Invar steel thickness is 19.05mm, according to the needs of assembling, selects single-sided welding forming technology.Treat that weldment opens double V-groove, bevel angle is 60 °, root face 1mm.The accessibility of welding gun radome fairing and welding wire when this groove type can meet backing welding, the setting of root face effectively can place the uniformity that prime coat weld seam is leaked, improves in weldering.Carry out spot welding in welding final position before weldering and prevent transversely deforming.The distortion of reversible deformation clamping pilot angle is adopted, reversible deformation angle 1.5-2 °, root face spacing 1.5-1.8mm before weldering.Not preheating, dry extension of electrode is 15mm, and welding process protection adopts 97.5%Ar+2.5%CO
2rich argon atmospher, flow-control is at 18-19L/min.Postwelding air cooling, interlayer temperature controls below 100 DEG C.
D) Invar steel thick plate multilayer single track automatic welding path planning: described Invar steel board thickness is 19.05mm, designs five layers, every layer and adopts single-pass welding to fill.Prime coat weld seam is comparatively narrow, adopts straight line path of welding, and weld seam Origin And Destination distance two ends are respectively 2-3mm and 4-5mm; The second layer increases gradually to the 4th layer of weld width, adopts single track straight bead cannot meet filling needs, therefore design adopts swing path of welding.Involved major parameter has speed of welding v, torch swinging amplitude D, hunting frequency f and amplitude of oscillation time t.As shown in Figure 1, on main tracking direction, starting point S is the plane geometry center of backing weld seam, is welding starting point during pilot teaching; Interpolated point 1,2 both sides being positioned at starting point, for determining the amplitude swung when robot pilot teaching, distance weld groove wall distance is d=1-2mm; The root face time of staying generally gets 0.1s and can obtain and fuse effect preferably.In addition in long straight weld path of welding, interpolated point need be set up according to fusion length, to reduce by the welding wire error of tilt of welding front pose minor variations and bringing.
E) Invar steel thick plate multilayer pulse+swing MIG automatic soldering technique parameter designing: backing welding adopts pulse MIC straight line path of welding, welding current 235-240A, weldingvoltage 26.3-27.3V, speed of welding 0.35-0.4m/min.The second to layer 5 weld seam adopts pulse+simple low speed oscillations path of welding, sets up 3-5 interpolated point according to fusion length is equidistant.Second layer welding current 237-240A, weldingvoltage 27.1-27.3V, speed of welding 0.30-0.32m/min, the long 2.50-2.70mm of amplitude of fluctuation, hunting frequency 1.5-1.6Hz; Third layer weld seam welding current 240-242A, voltage 27.3V, speed of welding 0.18-0.21m/min, amplitude of oscillation 4.40-4.60mm, frequency 0.9-1.0Hz; 4th layer of welding current 244-246A, voltage 27.4V, speed of welding 0.16-0.18m/min, amplitude of oscillation 5.90-6.35mm, frequency 0.8-0.9Hz; Layer 5 (capping layer) welding current 245-250A, voltage 27.4-27.6V, speed of welding 0.13-0.15m/min, amplitude of oscillation 7.50-8.40mm, frequency 0.7-0.8Hz.
The automatic soldering technique of Invar mould steel of the present invention is illustrated below by two embodiments.
Embodiment 1
Welding base metal select Ni content be 35.67% Invar steel, be of a size of 100mm × 50mm × 19.05mm, open 60 ° of grooves, root face height 1mm, spacing 1.8mm; Welding wire is InvarM93, Ni content 36.20%, diameter 1.2mm.Adopt flexible clamping, reserved reversible deformation angle is 2 °, and rich argon atmospher flow is 18L/min; Welding equipment be Tangshan Panasonic produce TAWERS-1400 integral type welding special purpose robot, welding gun with treat that weldment is vertical, employing straight polarity direct current; Before weldering workpiece grooves to be polished and surface film oxide and impurity are removed in acetone wiping; Carry out the teaching of welding track and the setting of parameter afterwards, design parameter is as follows:
● ground floor: straight path, welding current 235A, weldingvoltage 26.3V, speed 0.35m/min;
● the second layer: simple low speed oscillations track, welding current 237A, weldingvoltage 27.1V, speed 0.3m/min, amplitude of oscillation 2.5mm, frequency 1.6Hz, root face time of staying 0.1s;
● third layer: simple low speed oscillations track, welding current 240A, weldingvoltage 27.3V, speed 0.23m/min, amplitude of oscillation 4.5mm, frequency 1.0Hz, root face time of staying 0.1s;
● the 4th layer: simple low speed oscillations track, welding current 245A, weldingvoltage 27.4V, speed 0.18m/min, amplitude of oscillation 6mm, frequency 0.9Hz, root face time of staying 0.1s;
● layer 5: simple low speed oscillations track, welding current 245A, weldingvoltage 27.4V, speed 0.14m/min, amplitude of oscillation 7.5mm, frequency 0.8Hz, root face time of staying 0.1s;
● receive arc improve parameter unification and be set to welding current 140A, voltage 22.0V, down slope time 1.5s.
As shown in Figure 2, can find out that weld seam is slightly recessed arc, backing welding face of weld is smooth for Invar steel postwelding macro morphology, and without obviously splashing, weld seam both sides and mother metal fuse well, transitions smooth; There is the distinctive staggered fish scale-shaped texture of weave bead welding in the second to layer 5 weld seam, melt run is comparatively full, continuity good, has no the problems such as undercut, lack of fusion, surface splashing.
As shown in Figure 3, almost without any defect, prime coat through welding is all right, and adjacent layer melt run is invisible, embodies very high quality of weld joint for Invar steel section of weld joint pattern.
Embodiment 2
Welding base metal select Ni content be 35.67% Invar steel, be of a size of 250mm × 250mm × 19.05mm, open 60 ° of grooves, root face height 1mm, spacing 1.6mm; Welding wire is InvarM93, Ni content 36.20%, diameter 1.2mm.Adopt flexible clamping, reserved reversible deformation angle is 1.8 °, and rich argon atmospher flow is 18L/min; Welding equipment is the TAWERS-1400 integral type welding special purpose robot that Tangshan Panasonic produces, and welding wire leans forward 10 °, adopts straight polarity direct current; Welding left and right directions replaces mutually; Before weldering workpiece grooves to be polished and surface film oxide and impurity are removed in acetone wiping; Carry out the teaching of welding track and the setting of parameter afterwards, design parameter is:
● ground floor: straight path, welding current 240A, weldingvoltage 27.3V, speed 0.38m/min;
● the second layer: simple low speed oscillations track, welding current 240A, weldingvoltage 27.3V, speed 0.3m/min, amplitude of oscillation 2.78mm, frequency 1.6Hz, root face time of staying 0.1s;
● third layer: simple low speed oscillations track, welding current 240A, weldingvoltage 27.3V, speed 0.21m/min, amplitude of oscillation 5.00mm, frequency 1.0Hz, root face time of staying 0.1s;
● the 4th layer: simple low speed oscillations track, welding current 242A, weldingvoltage 27.3V, speed 0.18m/min, amplitude of oscillation 6.24mm, frequency 0.9Hz, root face time of staying 0.1s;
● layer 5: simple low speed oscillations track, welding current 245A, weldingvoltage 27.4V, speed 0.14m/min, amplitude of oscillation 8.34mm, frequency 0.8Hz, root face time of staying 0.1s;
● receive arc improve parameter unification and be set to welding current 140A, voltage 22.0V, down slope time 1.5s.
As shown in Figure 4, on the whole, appearance of weld is substantially even, and occur obvious scalelike mark, surface quality is higher for Invar steel postwelding macro morphology.Ground floor weld seam left end (end) 2/5 place has occurred that slight weld seam tilts, and infers that possible cause is too high for welding terminating point pilot teaching position, or the arc offset that the mild distortion of welding wire causes.But in the second layer, weld seam tilts to obtain effective improvement, embody pulse MIC and swing the larger process tolerance of welding.
A series of detection is carried out to the welding point in embodiment 2: tensile strength is 433-435Mpa, be all slightly higher than strength of parent (432Mpa); The normal temperature air-leakage test of weldment adopts film on surface vacuumizing method, and vacustat closes vacuum source after-0.88MPa; The high temperature air-leakage test of weldment adopts similar approach, probe temperature is 180 DEG C, pressure 0.6MPa, and the heat-insulation pressure keeping time is 15-30min, in in 5min, the vacuum transducer number of degrees decline and are less than 0.017Mpa, and therefore the normal temperature of weldment and high temperature air-tightness all reach relevant acceptance criteria.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.
Claims (1)
1. an automatic soldering technique for Invar mould steel, is characterized in that: comprise the steps
A) welding material select: the weight content of described Invar mould steel sheet material chemical composition is: Fe63.06%, Ni35.67%, Mn0.49%, Cr0.26%, Si0.24%, Co0.14%, Mo0.13%, welding material used is InvarM93 welding wire, gage of wire 1.2mm, the weight content of welding wire chemical composition is: Fe61.43%, Ni36.20%, Mn0.55%, Al0.54%, Si0.53%, Mo0.53%, Cr0.23%;
B) the selecting of welding equipment: institute's use welding equipment is integral type MIG arc-welding special purpose robot, rated welding current 350A, and speed of welding is 0.01-180m/min;
C) design of Invar mould steel slab weldment bevel shape and welds prepares: described Invar mould steel thickness is 19.05mm; according to the needs of assembling; select single-sided welding forming technology; treat that weldment opens double V-groove; bevel angle is 60 °; root face 1mm; carry out spot welding in welding final position before weldering and prevent transversely deforming; the distortion of reversible deformation clamping pilot angle is adopted before weldering; reversible deformation angle 1.5-2 °, root face spacing 1.5-1.8mm, not preheating; dry extension of electrode is 15mm, and welding process protection adopts 97.5%Ar+2.5%CO
2rich argon atmospher, flow-control at 18-19L/min, postwelding air cooling, interlayer temperature controls below 100 DEG C;
D) Invar mould steel slab multilayer single track automatic welding path planning: described Invar mould steel sheet metal thickness is 19.05mm, designing five layers, every layer adopts single-pass welding to fill, prime coat weld seam is comparatively narrow, adopt straight line path of welding, weld seam Origin And Destination distance two ends are respectively 2-3mm and 4-5mm, the second layer increases gradually to the 4th layer of weld width, and design adopts and swings path of welding;
E) Invar mould steel slab multilayer pulse+swing MIG automatic soldering technique parameter designing: backing welding adopts pulse MIC straight line path of welding, welding current 235-240A, weldingvoltage 26.3-27.3V, speed of welding 0.35-0.4m/min, the second to layer 5 weld seam adopts pulse+simple low speed oscillations path of welding, 3-5 interpolated point is set up, second layer welding current 237-240A, weldingvoltage 27.1-27.3V, speed of welding 0.30-0.32m/min, the long 2.50-2.70mm of amplitude of fluctuation, hunting frequency 1.5-1.6Hz according to fusion length is equidistant; Third layer weld seam welding current 240-242A, voltage 27.3V, speed of welding 0.18-0.21m/min, amplitude of oscillation 4.40-4.60mm, frequency 0.9-1.0Hz; 4th layer of welding current 244-246A, voltage 27.4V, speed of welding 0.16-0.18m/min, amplitude of oscillation 5.90-6.35mm, frequency 0.8-0.9Hz; Layer 5 welding current 245-250A, voltage 27.4-27.6V, speed of welding 0.13-0.15m/min, amplitude of oscillation 7.50-8.40mm, frequency 0.7-0.8Hz.
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| CN107442935A (en) * | 2017-08-31 | 2017-12-08 | 北京航星机器制造有限公司 | A kind of aluminium alloy laser oscillating welding technique |
| CN107511584A (en) * | 2017-08-31 | 2017-12-26 | 北京航星机器制造有限公司 | A kind of shape of a saddle aluminium alloy structure laser welding process method |
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| CN114423558B (en) * | 2019-10-04 | 2024-03-01 | 日本制铁株式会社 | Welded joint and automobile part |
| CN114749757A (en) * | 2021-01-08 | 2022-07-15 | 株式会社达谊恒 | Welding robot |
| CN112935485A (en) * | 2021-03-12 | 2021-06-11 | 南京航空航天大学 | Nickel-based alloy die steel thick plate pulse MIG swing welding process |
| CN114012221A (en) * | 2021-11-26 | 2022-02-08 | 昌河飞机工业（集团）有限责任公司 | Welding method for forming die surface of invar alloy composite material |
| CN114799425A (en) * | 2022-06-30 | 2022-07-29 | 中国空气动力研究与发展中心高速空气动力研究所 | Welding process for invar steel medium plate |
| CN114799425B (en) * | 2022-06-30 | 2022-11-11 | 中国空气动力研究与发展中心高速空气动力研究所 | Invar steel medium plate welding process |
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