CN110480154B - Welding method of laser tailor-welded blank - Google Patents
Welding method of laser tailor-welded blank Download PDFInfo
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- CN110480154B CN110480154B CN201910610534.9A CN201910610534A CN110480154B CN 110480154 B CN110480154 B CN 110480154B CN 201910610534 A CN201910610534 A CN 201910610534A CN 110480154 B CN110480154 B CN 110480154B
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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
- B23K26/0093—Working by laser beam, e.g. welding, cutting or boring combined with mechanical machining or metal-working covered by other subclasses than B23K
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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
- B23K26/24—Seam welding
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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
- B23K26/60—Preliminary treatment
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Abstract
The invention discloses a welding method of a laser tailor-welded blank, which comprises the following steps: A. blanking: firstly, blanking a first steel plate blank and a second steel plate blank into a first steel plate and a second steel plate; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate; B. splicing: splicing the first steel plate and the second steel plate to obtain splice welding edges, and enclosing process notches at two ends of the first steel plate and the second steel plate into two splice welding notches; C. laser welding: the method comprises the steps of enabling laser to advance 0.5 mm in the tailor-welding direction at one end of the notch side edge of a first steel plate of a tailor-welding notch, starting laser arc striking, then welding along the splice-welding edges of the first steel plate and a second steel plate to form a welding seam, and finally stopping arc stopping welding when the laser advances to another tailor-welding notch and is 0.5 mm away from the other end of the notch side edge of the first steel plate. Compared with the prior art, the invention can solve the problem that defects are easily generated at two ends of the welding line of the existing laser tailor-welded blank.
Description
Technical Field
The invention relates to the technical field of automobile manufacturing, in particular to a welding method of a laser tailor-welded blank for automobile manufacturing.
Background
The laser tailor-welded blank is generally formed by laser tailor-welding two kinds of steel plates with different strength and thickness, and is widely used for producing parts such as automobile body-in-white front longitudinal beams, automobile door inner plates, panoramic skylights and the like. The method comprises the following steps of (1) finding that 0-5 mm areas at two ends of a welding seam are easy to generate defects in a laser tailor-welded blank which is subjected to tailor-welding, so that parts are cracked in subsequent punching; in order to ensure that defects at two ends of a welding line do not appear on parts, the two ends of the welding line of the laser tailor-welded blank are cut off, so that the utilization rate of steel is reduced; the existing engineers adopt dynamic adjustment of laser welding parameters to try to improve the defects of welding seams at two ends of a laser tailor-welded blank, and the welding method is that firstly, laser is made to enter along the normal of a base metal at an arcing end, and after the laser travels a certain distance, the incident direction of the laser, namely the arcing end and the welding direction form an obtuse angle; secondly, in the arc-closing stage, after the laser travels for a certain distance, the incident direction of the laser, namely the arc-closing end, and the welding direction form an acute angle. This method has the following problems in the production process: 1. the laser welding method with fixed parameters is generally adopted in the industry, and the method allows the defects at the arc starting and arc stopping positions; 2. the method for dynamically adjusting the laser welding incident angle plays a certain role in shortening the defects at the arc starting and arc stopping positions, and the risk of cracking from the defects still exists in the subsequent punching or automobile driving process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a welding method of a laser tailor-welded blank so as to solve the problem that defects are easily generated at two ends of a welding seam of the existing laser tailor-welded blank.
The technical scheme adopted by the invention for solving the technical problem is as follows: a welding method of a laser tailor-welded blank is characterized by comprising the following steps of:
A. blanking: firstly, blanking a first steel plate blank and a second steel plate blank into a first steel plate and a second steel plate which are provided with two transverse side edges and two longitudinal side edges; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate, wherein the process notch is provided with an arc-shaped inner surrounding edge of which one end is connected with one longitudinal side edge of the second steel plate, the other end of the arc-shaped inner surrounding edge is connected with one end of a notch auxiliary side edge, and the other end of the notch auxiliary side edge is connected with one transverse side edge of the second steel plate for later use;
B. splicing: splicing one longitudinal side edge of the first steel plate and the longitudinal side edge of the second steel plate with process notches punched at two ends of the first steel plate to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate and the two process notches at two ends of the longitudinal side edge of the second steel plate into two spliced welding notches;
the tailor-welded notch is formed by enclosing a notch outer width, a notch side edge, the arc inner surrounding edge and the notch auxiliary side edge; wherein, the side edge of the notch is arranged on the longitudinal side edge of the first steel plate;
C. laser welding: firstly enabling laser to advance 0.5 mm along the tailor-welding direction at one end of the notch side edge of the first steel plate of the tailor-welding notch, starting laser arcing, then welding along the tailor-welding edge of the first steel plate and the second steel plate to form the welding line, and finally stopping arc ending when the laser advances to the other tailor-welding notch and is 0.5 mm away from the other end of the notch side edge of the first steel plate.
In the technical scheme of the welding method of the laser tailor-welded blank, a more specific technical scheme can also be that: and C, when the laser welding is carried out, the laser beam deflects to one side of the first steel plate.
Further: the arc-shaped inner surrounding edge is arc-shaped, and the radius of the arc-shaped inner surrounding edge is the radius r; the tangent line of surrounding edge in the arc with the contained angle between the welding seam is arc tangent line angle theta, arc tangent line angle theta equals 90.
Further: the size of the external width of the notch is satisfied: the outer width of the notch is not less than 0.5 mm and not more than 5 mm; the size of the auxiliary side edge of the notch can satisfy the following conditions: the auxiliary side edge of the notch is not less than 0 mm and not more than 4.5 mm.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects: 1. because the two ends of the first steel plate and the second steel plate with different thicknesses are provided with the tailor-welded notches, when in tailor-welding, after laser travels 0.5 mm along the tailor-welding direction at one end of the tailor-welded edge of the thick steel plate, laser arc starting is carried out, and at the moment, molten iron on the side of the tailor-welded edge thick steel plate naturally forms an arc-shaped transition welding seam end face at the top point of a tangent angle theta of the welding seam arc starting end; meanwhile, when the laser advances to a position 0.5 mm away from the other end of the splicing welding edge, the arc ending is finished, and the molten iron on the thick steel plate side of the splicing welding edge naturally forms an arc transition welding seam end face at the vertex of the tangent angle theta of the arc ending end of the welding seam; the two process gaps can improve the defects of air holes, cracks, collapse and the like at the arc starting position and the arc ending position due to insufficient molten iron supplement, the problems of punching cracking or fatigue cracking and the like of the welding seam end face at the arc starting position and the arc ending position due to stress concentration can be improved by the arc transition welding seam end face, the dynamic and static mechanical properties of the two ends of the welding seam are improved, and the service lives of parts such as a front longitudinal beam and a rear longitudinal beam which have high requirements on structural properties and fatigue resistance are prolonged; 2. along with the improvement of dynamic and static mechanical properties of two ends of the welding line, under a certain design working condition, the two ends of the welding line of the part formed by punching the laser tailor-welded blank can be reserved on the part body, so that the part after being formed can be free from trimming, the utilization rate of steel is improved, and the production cost of the part is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a partially enlarged view of fig. 1 at a.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1:
as shown in fig. 1, the laser tailor-welded blank includes a first steel plate 1 and a second steel plate 2 welded together by a weld seam 3, the first steel plate 1 of the present embodiment is a cold-rolled plate 780DP with a plate thickness of 2.2 mm, the second steel plate 2 is a cold-rolled plate 590DP with a plate thickness of 1.6 mm, the thickness of the first steel plate 1 is greater than that of the second steel plate 2, and the welding method for the first steel plate 1 and the second steel plate 2 to be tailor-welded into the laser tailor-welded blank by laser comprises the following steps:
A. blanking: firstly, a first steel plate blank and a second steel plate blank are blanked into a first steel plate 1 and a second steel plate 2 which are provided with two transverse side edges and two longitudinal side edges, wherein the two transverse side edges of the first steel plate 1 are respectively a transverse side edge 1-1 and a transverse side edge 1-2, and the two transverse side edges of the second steel plate 2 are respectively a transverse side edge 2-1 and a transverse side edge 2-2; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate 2, wherein the process notch is provided with an arc-shaped inner surrounding edge d4, one end of the arc-shaped inner surrounding edge d4 is connected with one end of a notch auxiliary side edge d3, and the other end of the notch auxiliary side edge d3 is connected with one transverse side edge 2-1 of the second steel plate 2; the other end of the auxiliary side edge of the notch of the other process notch of the second steel plate 2 is connected with the other transverse side edge 2-2 of the second steel plate 2; the included angle between the tangent line of the arc inner surrounding edge d4 and the welding seam is an arc tangent line angle theta, and the arc tangent line angle theta of the embodiment is 90 degrees; in the embodiment, the radius r of the arc-shaped inner peripheral edge d4 is 0.5 mm, and the notch auxiliary side edge d3 and the notch side edge d1 are arranged in parallel; the size of the notch side d1 is 0.5 mm in the embodiment; the size of the notch outer width d2 of the embodiment is 0.5 mm, and the size of the notch outer width d2 satisfies the following requirements: the external width d2 of the gap is not less than 0.5 mm and not more than 5 mm; the size of the auxiliary notch side d3 is 0, and the size of the auxiliary notch side d3 should satisfy: the gap auxiliary side d3 is more than or equal to 0 and less than or equal to 4.5 mm for standby;
B. splicing: splicing one longitudinal side edge of a first steel plate 1 and the longitudinal side edge of a second steel plate 2 with process notches punched at two ends to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate 1 and the two process notches at two ends of the longitudinal side edge of the second steel plate 2 to form two spliced welding notches;
the tailor-welded gap is formed by enclosing a gap outer width d2, a gap side edge d1, an arc inner surrounding edge d4 and a gap auxiliary side edge d 3; wherein, the notch side edge d1 is arranged on the longitudinal side edge of the first steel plate 1; in the present embodiment, the size of the notch side d1 is 0.5 mm, the arc tangent angle θ is 90 °, the radius of the arc inner peripheral edge d4 is 0.5 mm, and the size of the notch auxiliary side d3 is 0, as shown in fig. 2;
C. laser welding: firstly, enabling laser to travel 0.5 mm in the tailor-welding direction at one end of a notch side edge d1 of a first steel plate 1 of a tailor-welding notch, starting laser arcing, then welding along the tailor-welding edges of the first steel plate 1 and a second steel plate 2 to form a welding seam 3, and enabling a laser beam to deviate to one side of the first steel plate 1, namely a thick steel plate, during laser welding; and finally, when the laser travels to the other tailor-welded notch and is 0.5 mm away from the other end of the notch side edge d1 of the first steel plate 1, the arc is closed and the welding is terminated.
Example 2:
as shown in fig. 1, the laser tailor-welded blank includes a first steel plate 1 and a second steel plate 2 welded together by a weld seam 3, the first steel plate 1 of the present embodiment is a cold-rolled plate 780DP with a plate thickness of 2.2 mm, the second steel plate 2 is a cold-rolled plate 590DP with a plate thickness of 1.6 mm, the thickness of the first steel plate 1 is greater than that of the second steel plate 2, and the welding method for the first steel plate 1 and the second steel plate 2 to be tailor-welded into the laser tailor-welded blank by laser comprises the following steps:
A. blanking: firstly, a first steel plate blank and a second steel plate blank are blanked into a first steel plate 1 and a second steel plate 2 which are provided with two transverse side edges and two longitudinal side edges, wherein the two transverse side edges of the first steel plate 1 are respectively a transverse side edge 1-1 and a transverse side edge 1-2, and the two transverse side edges of the second steel plate 2 are respectively a transverse side edge 2-1 and a transverse side edge 2-2; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate 2, wherein the process notch is provided with an arc-shaped inner surrounding edge d4, one end of the arc-shaped inner surrounding edge d4 is connected with one end of a notch auxiliary side edge d3, and the other end of the notch auxiliary side edge d3 is connected with one transverse side edge 2-1 of the second steel plate 2; the other end of the auxiliary side edge of the notch of the other process notch of the second steel plate 2 is connected with the other transverse side edge 2-2 of the second steel plate 2; the included angle between the tangent line of the arc inner surrounding edge d4 and the welding seam is an arc tangent line angle theta, and the arc tangent line angle theta of the embodiment is 90 degrees; the radius r of the arc-shaped inner surrounding edge d4 of the embodiment is 5 mm; the size of the notch side d1 is 5 mm in the embodiment; the size of the notch outer width d2 of the embodiment is 5 mm, and the size of the notch outer width d2 satisfies the following requirements: the requirement that the external width d2 of the notch is not less than 0.5 mm and not more than 5 mm, the size of the auxiliary side d3 of the notch of the embodiment is 0, and the size of the auxiliary side d3 of the notch should satisfy the following requirements: the gap auxiliary side d3 is more than or equal to 0 and less than or equal to 4.5 mm for standby;
B. splicing: splicing one longitudinal side edge of a first steel plate 1 and the longitudinal side edge of a second steel plate 2 with process notches punched at two ends to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate 1 and the two process notches at two ends of the longitudinal side edge of the second steel plate 2 to form two spliced welding notches;
the tailor-welded gap is formed by enclosing a gap outer width d2, a gap side edge d1, an arc inner surrounding edge d4 and a gap auxiliary side edge d 3; wherein, the notch side edge d1 is arranged on the longitudinal side edge of the first steel plate 1; in the present embodiment, the size of the notch side d1 is 5 mm, the arc tangent angle θ is 90 °, the radius r of the arc inner peripheral edge d4 is 5 mm, and the size of the notch auxiliary side d3 is 0, as shown in fig. 2;
C. laser welding: firstly, enabling laser to travel 0.5 mm in the tailor-welding direction at one end of a notch side edge d1 of a first steel plate 1 of a tailor-welding notch, starting laser arcing, then welding along the tailor-welding edges of the first steel plate 1 and a second steel plate 2 to form a welding seam 3, and enabling a laser beam to deviate to one side of the first steel plate 1, namely a thick steel plate, during laser welding; and finally, when the laser travels to the other tailor-welded notch and is 0.5 mm away from the other end of the notch side edge d1 of the first steel plate 1, the arc is closed and the welding is terminated.
Example 3:
as shown in fig. 1, the laser tailor-welded blank includes a first steel plate 1 and a second steel plate 2 welded together by a weld seam 3, the first steel plate 1 of the present embodiment is a cold-rolled plate 780DP with a plate thickness of 2.2 mm, the second steel plate 2 is a cold-rolled plate 590DP with a plate thickness of 1.6 mm, the thickness of the first steel plate 1 is greater than that of the second steel plate 2, and the welding method for the first steel plate 1 and the second steel plate 2 to be tailor-welded into the laser tailor-welded blank by laser comprises the following steps:
A. blanking: firstly, a first steel plate blank and a second steel plate blank are blanked into a first steel plate 1 and a second steel plate 2 which are provided with two transverse side edges and two longitudinal side edges, wherein the two transverse side edges of the first steel plate 1 are respectively a transverse side edge 1-1 and a transverse side edge 1-2, and the two transverse side edges of the second steel plate 2 are respectively a transverse side edge 2-1 and a transverse side edge 2-2; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate 2, wherein the process notch is provided with an arc-shaped inner surrounding edge d4, one end of the arc-shaped inner surrounding edge d4 is connected with one end of a notch auxiliary side edge d3, and the other end of the notch auxiliary side edge d3 is connected with one transverse side edge 2-1 of the second steel plate 2; the other end of the auxiliary side edge of the notch of the other process notch of the second steel plate 2 is connected with the other transverse side edge 2-2 of the second steel plate 2; the included angle between the tangent line of the arc inner surrounding edge d4 and the welding seam is an arc tangent line angle theta, and the arc tangent line angle theta of the embodiment is 90 degrees; in the embodiment, the radius r of the arc-shaped inner peripheral edge d4 is 0.5 mm, and the notch auxiliary side edge d3 and the notch side edge d1 are arranged in parallel; the size of the notch side d1 is 5 mm in the embodiment; the size of the notch outer width d2 of the embodiment is 0.5 mm, and the size of the notch outer width d2 satisfies the following requirements: the external width d2 of the gap is not less than 0.5 mm and not more than 5 mm; the size of the notch auxiliary side d3 of the present embodiment is 4.5 mm, and the size of the notch auxiliary side d3 should satisfy: the gap auxiliary side d3 is more than or equal to 0 and less than or equal to 4.5 mm for standby;
B. splicing: splicing one longitudinal side edge of a first steel plate 1 and the longitudinal side edge of a second steel plate 2 with process notches punched at two ends to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate 1 and the two process notches at two ends of the longitudinal side edge of the second steel plate 2 to form two spliced welding notches;
the tailor-welded gap is formed by enclosing a gap outer width d2, a gap side edge d1, an arc inner surrounding edge d4 and a gap auxiliary side edge d 3; wherein, the notch side edge d1 is arranged on the longitudinal side edge of the first steel plate 1; in this embodiment, the dimension of the notch side d1 is 5 mm, the dimension of the notch outer width d2 is 0.5 mm, the radius r of the arc inner peripheral edge d4 is 0.5 mm, and the dimension of the notch auxiliary side d3 is 4.5 mm, as shown in fig. 2;
C. laser welding: firstly, enabling laser to travel 0.5 mm in the tailor-welding direction at one end of a notch side edge d1 of a first steel plate 1 of a tailor-welding notch, starting laser arcing, then welding along the tailor-welding edges of the first steel plate 1 and a second steel plate 2 to form a welding seam 3, and enabling a laser beam to deviate to one side of the first steel plate 1, namely a thick steel plate, during laser welding; and finally, when the laser travels to the other tailor-welded notch and is 0.5 mm away from the other end of the notch side edge d1 of the first steel plate 1, the arc is closed and the welding is terminated.
Example 4:
as shown in fig. 1, the laser tailor-welded blank includes a first steel plate 1 and a second steel plate 2 welded together by a weld seam 3, the first steel plate 1 of the present embodiment is a cold-rolled plate 780DP with a plate thickness of 2.2 mm, the second steel plate 2 is a cold-rolled plate 590DP with a plate thickness of 1.6 mm, the thickness of the first steel plate 1 is greater than that of the second steel plate 2, and the welding method for the first steel plate 1 and the second steel plate 2 to be tailor-welded into the laser tailor-welded blank by laser comprises the following steps:
A. blanking: firstly, a first steel plate blank and a second steel plate blank are blanked into a first steel plate 1 and a second steel plate 2 which are provided with two transverse side edges and two longitudinal side edges, wherein the two transverse side edges of the first steel plate 1 are respectively a transverse side edge 1-1 and a transverse side edge 1-2, and the two transverse side edges of the second steel plate 2 are respectively a transverse side edge 2-1 and a transverse side edge 2-2; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate 2, wherein the process notch is provided with an arc-shaped inner surrounding edge d4, one end of the arc-shaped inner surrounding edge d4 is connected with one end of a notch auxiliary side edge d3, and the other end of the notch auxiliary side edge d3 is connected with one transverse side edge 2-1 of the second steel plate 2; the other end of the auxiliary side edge of the notch of the other process notch of the second steel plate 2 is connected with the other transverse side edge 2-2 of the second steel plate 2; the radius of the arc-shaped inner surrounding edge d4 of the embodiment is 5 mm; the size of the notch side d1 is 9.5 mm in the embodiment; the size of the notch outer width d2 of the embodiment is 5 mm, and the size of the notch outer width d2 satisfies the following requirements: the external width d2 of the gap is not less than 0.5 mm and not more than 5 mm; the size of the auxiliary side d3 of the notch is 4.5, and the size of the auxiliary side d3 of the notch satisfies: the gap auxiliary side d3 is more than or equal to 0 and less than or equal to 4.5 mm for standby;
B. splicing: splicing one longitudinal side edge of a first steel plate 1 and the longitudinal side edge of a second steel plate 2 with process notches punched at two ends to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate 1 and the two process notches at two ends of the longitudinal side edge of the second steel plate 2 to form two spliced welding notches;
the tailor-welded gap is formed by enclosing a gap outer width d2, a gap side edge d1, an arc inner surrounding edge d4 and a gap auxiliary side edge d 3; wherein, the notch side edge d1 is arranged on the longitudinal side edge of the first steel plate 1; in this embodiment, the dimension of the notch side edge d1 is 9.5 mm, the dimension of the notch outer width d2 is 5 mm, the radius of the arc inner peripheral edge d4 is 5 mm, and the dimension of the notch auxiliary side edge d3 is 4.5, as shown in fig. 2;
C. laser welding: firstly, enabling laser to travel 0.5 mm in the tailor-welding direction at one end of a notch side edge d1 of a first steel plate 1 of a tailor-welding notch, starting laser arcing, then welding along the tailor-welding edges of the first steel plate 1 and a second steel plate 2 to form a welding seam 3, and enabling a laser beam to deviate to one side of the first steel plate 1, namely a thick steel plate, during laser welding; and finally, when the laser travels to the other tailor-welded notch and is 0.5 mm away from the other end of the notch side edge d1 of the first steel plate 1, the arc is closed and the welding is terminated.
Because the two ends of the first steel plate and the second steel plate with different strength difference are provided with the tailor-welded gaps, when in tailor-welding, after laser advances 0.5 mm along the tailor-welding direction at one end of the gap side d1 of the first steel plate 1 of the tailor-welded gap, laser arc striking starts, and at the moment, molten iron on the side of the tailor-welded thick steel plate forms an oval arc striking tailor-welded block at the arc striking position; meanwhile, when the laser travels to the other tailor-welded notch and is 0.5 mm away from the other end of the notch side edge d1 of the first steel plate 1, the arc ending is finished, so that the molten iron on the thick steel plate side of the tailor-welded edge forms an oval arc ending tailor-welded block at the arc starting position; the two tailor-welded blocks can change the shapes of small metal steam holes at the arc starting and arc ending positions, improve the defects of air holes, cracks and the like caused by insufficient molten iron supplement, and ensure that the defects can not be generated in the area of 0 to 5 millimeters from the end L at the two ends of the tailor-welded edges of the first steel plate and the second steel plate.
Claims (4)
1. A welding method of a laser tailor-welded blank is characterized by comprising the following steps of:
A. blanking: firstly, blanking a first steel plate blank and a second steel plate blank into a first steel plate and a second steel plate which are provided with two transverse side edges and two longitudinal side edges; respectively punching a process notch at two ends of one longitudinal side edge of the second steel plate, wherein the process notch is provided with an arc-shaped inner surrounding edge (d 4) with one end connected with one longitudinal side edge of the second steel plate, the other end of the arc-shaped inner surrounding edge (d 4) is connected with one end of a notch auxiliary side edge (d 3), and the other end of the notch auxiliary side edge (d 3) is connected with one transverse side edge of the second steel plate for standby;
B. splicing: splicing one longitudinal side edge of the first steel plate and the longitudinal side edge of the second steel plate with process notches punched at two ends of the first steel plate to obtain a spliced welding edge, and respectively enclosing the longitudinal side edge of the first steel plate and the two process notches at two ends of the longitudinal side edge of the second steel plate into two spliced welding notches;
the tailor-welded notch is formed by enclosing a notch outer width (d 2), a notch side edge (d 1), the arc inner surrounding edge (d 4) and the notch auxiliary side edge (d 3); wherein the notch side edge (d 1) is arranged on the longitudinal side edge of the first steel plate;
C. laser welding: firstly enabling laser to advance 0.5 mm along the tailor-welding direction at one end of the notch side edge (d 1) of the first steel plate of the tailor-welding notch, starting laser arcing, then welding along the tailor-welding edge of the first steel plate and the second steel plate to form the welding seam, and finally stopping welding when the laser advances to the other tailor-welding notch and is 0.5 mm away from the other end of the notch side edge (d 1) of the first steel plate.
2. The welding method of a laser tailor welded blank according to claim 1, wherein: and C, when the laser welding is carried out, the laser beam deflects to one side of the first steel plate.
3. The welding method of a laser tailor welded blank according to claim 1 or 2, wherein: the arc-shaped inner surrounding edge (d 4) is arc-shaped, and the radius of the arc-shaped inner surrounding edge (d 4) is the radius r; the included angle between the tangent of the intersection point of the arc inner surrounding edge (d 4) and the welding seam is an arc tangent angle theta, and the arc tangent angle theta is 90 degrees.
4. A method of welding a laser tailor welded blank according to claim 3, wherein: the size of the gap outer width (d 2) is satisfied: the outer width (d 2) of the notch is less than or equal to 0.5 mm and less than or equal to 5 mm; the dimensions of the notch auxiliary side (d 3) are such that: the auxiliary side edge (d 3) of the notch is more than or equal to 0 and less than or equal to 4.5 mm.
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| CN111716067B (en) * | 2020-05-14 | 2023-01-17 | 广汽新能源汽车有限公司 | Auxiliary vehicle plate manufacturing process, auxiliary vehicle frame manufacturing process and auxiliary vehicle frame |
| CN112589271B (en) * | 2020-11-10 | 2022-01-11 | 东风汽车集团有限公司 | Laser tailor-welded blank, tailor-welded stamped workpiece and laser tailor-welding method |
| CN113210864B (en) * | 2021-05-28 | 2023-04-18 | 东风柳州汽车有限公司 | Laser tailor-welding blank for reinforcing frame of automobile skylight and manufacturing method |
| CN114670023A (en) * | 2022-03-17 | 2022-06-28 | 大连富地重工机械制造有限公司 | Multi-weld seam welded pipe production line |
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| JPH06315798A (en) * | 1993-05-07 | 1994-11-15 | Kobe Steel Ltd | Backing material for high energy beam welding |
| JP3854490B2 (en) * | 2001-10-25 | 2006-12-06 | 日立建機株式会社 | Laser welding method for differential thickness materials |
| DE102010011253B4 (en) * | 2010-03-12 | 2013-07-11 | Precitec Kg | Laser processing head, robot apparatus and method for processing a workpiece by means of a laser beam |
| CN205571752U (en) * | 2016-04-21 | 2016-09-14 | 东风模具冲压技术有限公司 | Prevent laser welding sheet material of fracture |
| CN109048059B (en) * | 2018-08-13 | 2021-03-23 | 江苏大学 | Laser scanning wire filling welding method for thin plate |
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