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Welding method of Q890 high-strength steel

A welding method and high-strength steel technology, applied in welding equipment, laser welding equipment, welding/welding/cutting items, etc., can solve the problems of increasing penetration depth, high welding cost and incapable of industrial production, and achieve the prevention of welding cold cracks, Improved welding efficiency and excellent mechanical properties

Inactive Publication Date: 2016-08-24
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Laser welding with high energy density can also be used to weld high-strength steel Q890. Laser welding has the advantages of increasing penetration and reducing the impact on the heat-affected zone. Excellent weld mechanical properties and microstructure can be obtained, but in welding high-strength steel Q890 For medium and thick plates, the high welding cost of laser welding cannot make this method widely used in industrial production

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  • Welding method of Q890 high-strength steel
  • Welding method of Q890 high-strength steel

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Experimental program
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Effect test

Embodiment Construction

[0015] 1. Process the test plate: such as figure 2 As shown, the test plate is 150mm wide, 350mm long, δ=25mm thick, with a blunt V-shaped groove α=60°, and blunt side p=5mm.

[0016] 2. Clean the groove: clean the 30mm inner surface on both sides of the groove.

[0017] 3. The welding material is selected as 90KG welding wire, and the shielding gas is 80%Ar+20%CO 2 .

[0018] 4. Preheat the assembled parts to be welded to 80°C.

[0019] 5. Apply laser-arc hybrid welding:

[0020] ① The workpiece to be welded is ground welded, the laser is in front, the MIG heat source is in the back, the laser power is 3.0KW, the current is 240A, the voltage is 25V, the distance between the light wires is 3mm, the defocus is 4mm, and the welding speed is 0.8cm / s.

[0021] ② Filler welding is performed on the workpiece to be welded, the laser is placed in front, the MIG heat source is placed behind, the laser power is 3.5KW, the current is 260A, the voltage is 28V, the distance between t...

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Abstract

The invention discloses a Q890 high-strength steel welding method, which belongs to the technical field of high-strength steel welding. It is characterized by processing the test plate: beveling, the form of the bevel is shown in the figure, the thickness of the test plate is δ≤50mm, the bevel angle is α=40~60°, and the blunt edge p=4~10mm. Clean the surfaces on both sides of the groove. Select welding material: the welding material is 90KG grade welding wire. Preheat the base metal Q890 steel to be welded, and the preheating temperature is 60~100°C. Apply laser-arc compound heat source to control the welding interlayer temperature, and the interlayer temperature is controlled at 150~250℃. Temper heat treatment after welding.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel welding, and in particular relates to a Q890 high-strength steel welding method. Background technique [0002] As mining machinery and engineering machinery bear more and more loads, high-strength steel medium-thick plates are the preferred steel materials for hydraulic supports. The use of high-strength steel can not only reduce the weight of the steel structure itself, meet safety performance requirements, but also effectively Improve the utilization efficiency of iron and steel resources, reduce energy consumption and pollutant emissions. At present, in the research of high-strength steel Q890 welding at home and abroad, due to ensuring the strength and ductility requirements of high-strength steel Q890, adding a large amount of alloying elements makes the carbon equivalent of the base metal higher, and welding cold cracks will appear in the conventional arc welding process. Deform...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K26/60
CPCB23K26/348B23K26/60B23K2103/04
Inventor 高珊朱彦军李永堂吴志生帅朋
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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