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High-strength or ultra-high strong steel laser-electrical arc composite heat source welding method

A composite heat source, ultra-high-strength steel technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of complex welding process, difficult welding work, and deterioration of workers' operating environment.

Inactive Publication Date: 2009-02-18
HARBIN WELDING INST LTD
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Problems solved by technology

Although pre-weld preheating can improve the cold crack susceptibility of welded joints, it brings a series of problems
On the one hand, the preheating before welding makes the welding process complicated and reduces the welding efficiency; on the other hand, the workpiece after high temperature preheating deteriorates the operating environment for workers; moreover, for some complex shapes or large sizes The workpiece cannot be preheated effectively, which brings great difficulties to the welding work

Method used

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Embodiment Construction

[0020] The laser used in the test is the HL2006D Nd:YAG solid-state laser produced by the German HAAS company, with a maximum output power of 2.6kW and a continuous wave laser with an output wavelength of 1.06μm, and a focusing lens with a focal length of 200mm; the arc welding machine is produced by the Austrian Fonius company TPS5000 digital GMA welding power supply and wire feeder; the HS-80 low-alloy high-strength steel welding wire with a diameter of 1.2 (strength grade 80kg) developed by the Harbin Welding Research Institute is selected; the high-strength steel base materials used in the test are 12mm thick JFE980S low-alloy high-strength steel (tensile strength 980MPa), 25mm thick HG980 low-alloy high-strength steel (tensile strength 980MPa) and 25mm thick 35CrMnSiA ultra-high-strength steel (tensile strength 1700MPa).

[0021] The test is divided into inclined Y-groove welding crack test and butt joint performance test. The oblique Y-groove welding crack test is carrie...

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Abstract

The invention provides a novel high-strength or ultrahigh-strength steel laser-arc composite heat source welding method, which belongs to the technical field of the welding of high-strength or ultrahigh-strength steel. The method aims to solve the technical problem that the higher temperature needs to be adopted for preheating in order to prevent cold cracks during the welding of the high-strength or ultrahigh-strength steel. The welding method mainly comprises the following steps: the laser power is higher than 800 watts, a composite form that laser (2) is ahead and electric arc (3) follows is adopted along the welding direction, the filament spacing h is controlled to between 3 and 7 millimeters, and an included angle theta between an electric arc welding gun (4) and the horizontal plane is between 45 and 60 DEG. When the method is used to weld, a composite heat source welding pool is elongated and the oscillation of the pool is sharpened, so that the solidification rate of pool metal is reduced and grains are refined, thereby reducing the cold crack sensitivity during the welding process of the high-strength or ultrahigh-strength steel. The welding method can reduce the preheating temperature of the welding of the high-strength or ultrahigh-strength steel, and even can realize high-strength non-preheating welding.

Description

Technical field: [0001] A new laser-arc composite heat source welding method for high-strength or ultra-high-strength steel proposed by the present invention belongs to the technical field of high-strength or ultra-high-strength steel welding, and particularly relates to the ability to significantly reduce the tendency of cold crack cracking and welding of high-strength or ultra-high-strength steel welding. Laser-arc compound heat source welding method with preheating temperature. Background technique: [0002] As we all know, most high-strength or ultra-high-strength steels have a high tendency to harden. When welding high-strength or ultra-high-strength steels by conventional arc welding, the weld metal is prone to cold cracks. In order to prevent welding cold cracks, welding The workpiece to be welded needs to be preheated before, and the preheating temperature mainly depends on the chemical composition, strength grade, base metal thickness and welding structure of the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K26/348
Inventor 王旭友林尚扬雷振杜兵王威滕彬秦国梁徐孝福卜大川穆瑞骥于洪军
Owner HARBIN WELDING INST LTD
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