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A method for preventing welding cracks in vacuum electron beam welding of high carbon steel

A technology for vacuum electron beam welding and welding cracks, which is applied in the direction of electron beam welding equipment, welding equipment, welding/welding/cutting items, etc., and can solve problems such as difficulties

Active Publication Date: 2020-10-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if any enterprise wants to realize the vacuum composite welding of high carbon steel, it will undoubtedly cross the river by feeling the stones, and there are many difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 50 # Vacuum electron beam welding of steel composite slabs, the size of the upper and lower slabs is 250cm×1800cm×4000cm, the specific method is as follows:

[0030] 1) Milling and polishing the compound surface and side of the slab to be compounded according to the standard; after milling, the slab is polished and finely treated, and the joint surface of the compound slab is free of oil / rust, oxide layer / spot and dust after treatment .

[0031] 2) Before billet assembly, heat the composite billet with a hot slab at 300-500°C to about 150°C, and then start billet assembly. After the billet assembly is completed, place it on the rotary table and press a piece of 250- Heat the slab at 300°C, and then put the composite billet into the vacuum chamber to start vacuuming.

[0032] 3) Spot welding: the welding current of the spot welding operation is 150mA, and the welding speed is 8mm / s.

[0033] 4) Preheating before welding: Before continuous welding of 50# steel, the foc...

Embodiment 2

[0040] 60 # Vacuum electron beam welding of steel composite slabs, the dimensions of the upper and lower slabs are 300cm×2000cm×3500cm.

[0041] 1) Milling and polishing the compound surface and side of the slab to be compounded according to the standard; after milling, the slab is polished and finely treated, and the joint surface of the compound slab is free of oil / rust, oxide layer / spot and dust after treatment .

[0042] 2) Before billet assembly, heat the composite billet with a hot slab at 300-500°C to about 150°C, and then start billet assembly. After the billet assembly is completed, place it on the rotary table and press a piece of 250- Heat the slab at 300°C, and then put the composite billet into the vacuum chamber to start vacuuming.

[0043] 3) Spot welding: the welding current of the spot welding operation is 150mA, and the welding speed is 8mm / s.

[0044] 4) Preheating before welding: 60# steel sets the focal length of the electron beam to diverge before cont...

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PUM

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Abstract

The invention discloses a method for preventing welding cracks through high-carbon steel vacuum electron beam welding. By function changes of electron beams for vacuum welding, weld preheating of a high-carbon steel composite slab and changes of a steel structure near a weld joint are achieved, and accordingly the purpose of preventing the high-carbon steel vacuum welding process from generating cracks. Compared with the prior art, the method for preventing welding cracks through high-carbon steel vacuum electron beam welding has the beneficial effects that through the vacuum electron beam preheating welding technology, continuous and stable production of high-carbon steel composite slabs, especially the high-carbon steel of above 50# is achieved; and in the vacuum composite continuous welding process, the welding micro cracks and welding deformation problems are effectively controlled. The vacuum electron beam preheating technology solves the historical problem, troubling the international vacuum electron beam welding field, that billets of high-carbon steel cannot be preheated and thus real high-carbon steel cannot be welded. The method has the practical significance. The cogenttechnical support is provided for vacuum composite welding of the high-carbon steel.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a method for preventing welding cracks in vacuum electron beam welding of high-carbon steel composite slabs. Background technique [0002] High carbon steel is very sensitive to the formation of cold cracks due to its very large tendency to harden and form high carbon martensite. At the same time, the martensite structure formed in the welding heat-affected zone is hard and brittle, which leads to a great decrease in the plasticity and toughness of the joint. Therefore, the weldability of high-carbon steel is quite poor, and hot and cold cracks are prone to occur during welding. At present, when welding with structural steel electrodes, it must be preheated before welding, and the preheating temperature is controlled at 250°C to 350°C. For multi-layer multi-pass welding, the first pass uses small-diameter electrodes and low-current welding. Generally, the workpiece is p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/06B23K103/04
CPCB23K15/0053B23K15/06
Inventor 刘文飞金百刚王鲁毅李超周智勇张宏亮赵雷王亮
Owner ANGANG STEEL CO LTD