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Special brittleness processing device for 400-series stainless steel welding

A brittle treatment and stainless steel technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of easy welding stress, hydrogen-induced cracks, high hardening degree, etc., and achieve the effects of good extensibility, simple structure, and simple process

Inactive Publication Date: 2017-01-25
WUHAN KAIQI SPECIAL WELDING EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2. Due to the large temperature difference between the welding area before welding and welding, it is easy to produce welding stress. At the same time, due to the high welding strain rate, it is easy to produce welding cracks and the escape of diffusible hydrogen in the weld metal. Hydrogen-induced cracking, and the degree of hardening of the weld and the heat-affected zone is relatively high
[0005] The above two problems were finally solved after a lot of research and experiments in our company, but for 400 series stainless steel, because 400 series stainless steel has its own characteristics (ferrite and ferrite-austenite duplex), therefore, 400 series stainless steel When the weld of series stainless steel is welded, the weld brittleness will still be formed due to the metal structure being affected by heat (temperature drop)

Method used

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  • Special brittleness processing device for 400-series stainless steel welding
  • Special brittleness processing device for 400-series stainless steel welding
  • Special brittleness processing device for 400-series stainless steel welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A laser welding machine with on-line continuous weld seam heat treatment, including a welding trolley 1, and a shearing device 2, a laser welding device 3 and a rolling device 4 installed on the welding trolley 1 in sequence, and the welding trolley 1 Corresponding to the position in front of the laser welding device 3, there is a preheating device 5 capable of performing online continuous temperature rise and preheating of the welding area, and the preheating device 5 is arranged between the shearing device 2 and the laser welding device 3, The position corresponding to the rear of the laser welding device 3 on the welding trolley 1 is provided with a heat treatment device 6 capable of performing on-line continuous weld seam heat treatment on the weld seam area. Preheating the welding area before welding can not only reduce the welding stress, but also reduce the welding strain rate, which is beneficial to avoid welding cracks and the escape of diffused hydrogen in the ...

Embodiment 2

[0023] Embodiment 2 (for high-strength alloy steel and high-phosphorus steel, etc., of course, 400 series stainless steel can also adopt the scheme of this embodiment, but it is easy to produce brittleness):

[0024] A laser welding process with on-line continuous weld seam heat treatment, comprising the following steps:

[0025] 1) The on-line strip steel is cut and stitched by the shearing device 2 on the shearing station of the welding process;

[0026] 2) After the shearing and jointing is completed, the welding area of ​​the on-line strip steel is preheated to 100-200° C. through the preheating device 5 on the preheating station of the welding process;

[0027] 3) After heating up and preheating, the online steel strip is welded by the laser welding device 3 on the welding station of the welding process;

[0028] 4a1) After the welding is completed, the weld zone of the online strip steel is carried out on the primary normalizing station of the welding process through the ...

Embodiment 3

[0034] Embodiment 3 (specifically for 400 series stainless steel):

[0035] A laser welding process with on-line continuous weld seam heat treatment, comprising the following steps:

[0036] 1) The on-line strip steel is cut and stitched by the shearing device 2 on the shearing station of the welding process;

[0037] 2) After the shearing and jointing is completed, the welding area of ​​the on-line strip steel is preheated to 100-200° C. through the preheating device 5 on the preheating station of the welding process;

[0038] 3) After heating up and preheating, the online steel strip is welded by the laser welding device 3 on the welding station of the welding process;

[0039] 4a1) After the welding is completed, the weld zone of the online strip steel is carried out on the primary normalizing station of the welding process through the primary normalizing mechanism 6a1 for primary normalizing of the online continuous weld seam, and the primary normalizing temperature is 60...

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Abstract

The invention discloses a special brittleness processing device for 400-series stainless steel welding. The special brittleness processing device comprises an auxiliary engine trolley, and a water containing box, an annealing mechanism and a circulating water refrigerator which are distributed on the auxiliary engine trolley in sequence, quick chilling sprinkler heads used for quickly cooling front and reverse sides of a welding region for an on-line band steel are respectively arranged inside the water containing box, and at the position, on the auxiliary engine trolley, corresponding to the upper part of the water containing box, the quick chilling sprinkler heads are communicated with the outlet of the circulating water refrigerator, the water containing box is communicated with the inlet of the circulating water refrigerator, the heating temperature of the annealing mechanism ranges from 500 DEG C to 650 DEG C, and the annealing mechanism is a high frequency heater. At the aim of 400-series stainless steel specially, by additionally arranging the brittleness processing device in the position of the next procedure of the welding procedure and under the combination of heat treatment, the brittleness of the 400-series stainless steel is eliminated. Therefore, the plasticity and the extensibility of the 400-series stainless steel are further improved. The brittleness processing device is applicable to various welding machines.

Description

technical field [0001] The invention relates to the field of welding, in particular to a brittle treatment device specially used for welding 400 series stainless steel. Background technique [0002] With the rapid development of my country's automobile, bridge, construction, home appliance and other industries that have a large demand for steel, steel companies have higher and higher requirements for the output and quality of high-standard and cost-effective steel. At present, most domestic iron and steel enterprises are gradually moving towards product transformation and equipment upgrading. Therefore, the welding of special steel is a major problem that we are about to face, but the use of ordinary laser welding machines and welding processes cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high phosphorus steel. ,specifically: [0003] 1. Since laser welding is to emit a high-energy-dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50
Inventor 余磊陈俊芦洪波刘军夏思明张炼王卫强芦立楷
Owner WUHAN KAIQI SPECIAL WELDING EQUIP