Laser-arc hybrid welding method

A hybrid welding and laser arc technology, which is applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of slow welding speed, etc., and achieve the effect of improving low-temperature crack resistance and reducing the amount of diffusible hydrogen

Inactive Publication Date: 2015-02-11
JFE STEEL CORP
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Problems solved by technology

However, when compared with laser welding, the depth of penetration (penetration depth) is small and the welding speed is also slow

Method used

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Embodiment 1

[0043] Regarding the amount of diffusible hydrogen in the weld metal portion of the hybrid laser arc welded joint, the present invention will be described more specifically with examples given.

[0044] As a method of measuring the amount of hydrogen in a steel welded portion targeted for arc welding, the test method described in JIS Z 3118 is generally used. Therefore, in the measurement of diffusible hydrogen in hybrid laser arc welding, basic items such as the shape of the test piece, the capture of diffusible hydrogen, and the method of measuring the amount of hydrogen are carried out in accordance with JIS (Japanese Industrial Standards). That is, from the HT780 grade steel plate used as the test steel, a figure 2 Test plate 1A with plate thickness 12mm x width 25mm x length 40mm as shown and arc starting plate (end tab) 1B with plate thickness 12mm x width 25mm x length 45mm were measured for various laser arc hybrid welding conditions. The amount of diffusible hydroge...

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Abstract

By the present invention, in order to suppress cold cracking, consumable electrode type arc welding is placed at the preceding side and laser welding is placed at the succeeding side with respect to the direction of weld progress, using a high-strength steel sheet having a tensile strength of at least 780 MPa as the welding subject, the distance between the position at which a welding wire for arc welding is aimed and the position of laser beam irradiation is set to a range of 3-5 mm, the electrode angle for arc welding is set to a sweepback angle in the range of 20-60° toward the direction of weld progress, and the incidence angle of the laser beam for laser welding is set to an angle in the range of 0-30° in the direction of weld progress from the vertical direction.

Description

technical field [0001] The present invention relates to a laser arc hybrid welding method (laser and arc hybrid welding method) that uses laser welding (laser welding) and consumable electrode arc welding (consumable electrode arc welding), especially relates to a tensile strength (tensile strength) of 780MPa Laser arc hybrid welding method for the above high strength steel sheet or plate. Background technique [0002] Since laser welding can obtain high energy density (high-energy density), it can perform high-speed welding (high speed welding) with deep penetration (deep penetration), and it can be expected as a highly efficient welding method. Furthermore, since the melting is extremely localized, the influence of heat applied to the base material is also reduced, and a high-quality weld joint (weld joint) with little strain or deformation can be obtained. [0003] On the other hand, arc welding, which has been used frequently, can be handled more easily than laser weldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348
CPCB23K2203/04B23K26/1429B23K26/3206B23K26/32B23K26/348B23K2103/04B23K2103/50
Inventor 角博幸
Owner JFE STEEL CORP
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