Lap laser welded joint, manufacturing method of the welded joint, and frame member for automobiles
A technology of laser welding and manufacturing method, which is applied to laser welding equipment, welding/welding/cutting items, vehicle parts, etc., and can solve the problems of narrowing spacing, time-consuming welding, and decreasing heat generation.
Active Publication Date: 2020-11-17
JFE STEEL CORP
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[0110] Hereinafter, the present invention will be described based on examples.
[0111] The tensile strength and chemical composition of the tested materials are shown in Table 1. The unit in Table 1 is mass%, and the balance other than those shown in Table 1 is Fe and unavoidable impurities.
[0112] Use steel plates with a thickness of 1.2mm, 1.6mm, 1.8mm, and 4.2mm, such as Figure 5 As shown, bending is applied to form an L-shaped cross-sectional shape. The L-shaped steel plate 8 has a long side 8a and a short side 8b, the long side 8a is equivalent to the vertical wall portion 2a of the lap laser welded joint 1 steel plate 2, and the short side 8b is equivalent to the flange portion 2b (refer to figure 1 ). Then, after overlapping the L-shaped steel plates 8 of the same steel type and the same plate thickness on the short side 8b, laser welding is performed intermittently along the longitudinal direction of the overlapped part to form a weld (welded part 4), and the t...
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Abstract
The present invention provides lap laser welded joints with excellent peel strength and dimensional accuracy. In the lap laser welded joint 1 formed by laminating steel plates 2 and 3 and having a plurality of welded portions 4 whose surfaces are approximately C-shaped, the welded portion 4 includes a first linear portion 4a extending in the direction of arrangement and a The surface formed at both ends of the first linear portion 4a is a semicircular second linear portion 4b, the radius R (mm) of the semicircular shape and the thickness t (mm) of the steel plates 2 and 3 having a larger plate thickness (steel plate 2 , 3 are the same plate thickness, the same plate thickness t) satisfies 0<R≤1.5t, the gap G (mm) between steel plates 2 and 3 satisfies 0.25t or less, the distance between adjacent welded parts λ (mm) and the welding length l (mm) which is the sum of the lengths of the linear portions 4a, 4b satisfy 0.4≤l / λ<0.7, the plate thickness t satisfies 4.0 mm or less, and the end of the contact portion of the steel plates 2, 3 The distance X (mm) from the welded portion 4 satisfies 2t≤X≤4t, the plate thickness t and the width W (mm) of the welded portion 4 satisfy 0.3≤W / t≤1.0, and at least one of the steel plates 2 and 3 has a specific The composition and tensile strength of TS.
Description
technical field [0001] The present invention relates to a lap laser welded joint, a method for manufacturing the welded joint, and an automobile frame member formed by using the welded joint. Background technique [0002] In conventional welding of structural members of automobiles having flange portions, resistance spot welding is performed. However, resistance spot welding has problems in that it takes time to weld, that the calorific value decreases due to shunting, and that the pitch cannot be narrowed, and that there is a space restriction due to the torch of the welding machine. Therefore, in recent years, research has been conducted on laser welding in addition to conventional resistance spot welding. In laser welding, burn-through occurs when the gap between plates (plate gap) becomes too large. On the other hand, in the case of galvanized steel sheets, if an appropriate gap is not secured, the zinc coating on the overlapping surfaces evaporates and spatters occur,...
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IPC IPC(8): B23K26/21
CPCB23K26/32B23K26/244B23K2101/006B23K2103/04B23K26/0869B23K2101/18C22C38/02C22C38/04
Inventor 原亚怜木谷靖
Owner JFE STEEL CORP