Manufacturing method of laser welded joint and laser welded joint
A technology of laser welding and manufacturing methods, which is applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of cracked appearance at the end of the weld bead, the appearance has not been discussed, and the time is difficult, so as to achieve excellent appearance and high peel strength , the effect of inhibiting the rupture
Active Publication Date: 2021-01-05
JFE STEEL CORP
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Problems solved by technology
[0004] The method of Patent Document 1 is a method of welding from the side where the gap between the plates is small to the side where the gap is large, and there is a problem that a special clamping tool is required and only a predetermined welding path can be welded.
Also, there was no discussion about appearance
[0005] In addition, the method of Patent Document 2 is a method of improving the appearance of the weld by overlapping the welding lines to remelt the end of the weld, but it is difficult to use because of the problem that welding takes time.
[0006] It should be noted that the problem of cracks at the end of the weld bead and poor appearance is not limited to automotive structural members, but also occurs in laser welded joints used in other applications.
Method used
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[0115] Hereinafter, although an Example is used for further understanding of this invention, it demonstrates, However, An Example does not limit this invention at all.
[0116] (Examples of the present invention and comparative examples)
[0117] As the steel plate for laser welding, steel type I (tensile strength of 983 MPa, composition by mass % 0.13% of C, 1.40% of Si, 2.2% of Mn, 0.015% of P, 0.002% of S , 0.005% Ti, 0.021% Cr, 0.004% Mo, 0.0002% B) or steel type II (the tensile strength is 1184MPa, and the composition is 0.13% C, 1.40% Si, 2.2% by mass % % Mn, 0.012% P, 0.001% S, 0.005% Ti, 0.017% Cr, 0.004% Mo, 0.0003% B) and a steel plate with a thickness of 1.6 mm or 1.8 mm and a width of 50 mm. In addition, the tensile strength is the tensile strength calculated|required by manufacturing the JIS No. 5 tensile test piece in the direction parallel to a rolling direction from each steel plate, and carrying out the tensile test in compliance with JIS Z2241:2011.
[0118...
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Abstract
Provide a manufacturing method of laser welding joints with excellent appearance and excellent appearance. The manufacture method of a laser welding joint, which is obtained by laser welding joints by overlapping laser welding in the state of overlapping between the two steel plates between the two steel plates. Among them Thick set to T 1 , Set the thickness of the plate on the lower side to T 2 The width of the gap between the upper side and the steel plate on the lower side is set to A, and the process from the starting end of the welding channel to the full length of the welding channel is set to the initial welding. The process of forming welding trails near the 4 / 5 of the welding channel is set to formally welded, and the processes that are officially welded until the welding channel forms the welding channel. The output is set to P, and the laser output in the final welding is set to P to P f At this time, satisfy the formula (1). 0.8 (T 1 +T 2 ) / (K+t 1 +T 2 )) P <p f <(T 1 +T 2 ) / (K+t 1 +T 2 )) P (1) (A is 0.5T 1 And 0.5T 2 Below the small party, K = (t 2 / T 1 ) A).
Description
technical field [0001] The invention relates to a manufacturing method of a laser welding joint, a laser welding joint and a frame part for an automobile. Background technique [0002] Conventionally, resistance spot welding has been used for welding structural members of automobiles. However, resistance spot welding has problems that it takes time to weld, that the pitch cannot be narrowed due to shunting, and that there is also a problem that space is restricted by the torch of the welding machine. Therefore, in recent years, in addition to conventional spot welding, laser welding for joining steel plates by irradiating laser beams to the surfaces of stacked steel plates has been studied. In laser welding, laser beams are irradiated on the surfaces of stacked steel plates to melt and solidify the laser beam irradiated portions of the steel plates, thereby forming a weld bead and joining the steel plates to obtain a laser welded joint. However, there is a problem that cra...
Claims
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IPC IPC(8): B23K26/21B23K26/00B23K26/32B62D25/04C22C38/00C22C38/38
CPCB23K26/21B23K26/00B23K26/32B62D25/04C22C38/00C22C38/38B23K26/244
Inventor 原亚怜木谷靖
Owner JFE STEEL CORP