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Resistance welding technology with online continuous weld heat treatment

A resistance welding and process technology, applied in resistance welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the sudden rise and drop of temperature in the welding area, the inability to meet the requirements of special material steel grades, weld seams and heat-affected zones Fracture and other problems, to avoid the escape of diffusible hydrogen, avoid hydrogen-induced cracks, and reduce the welding strain rate.

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

Therefore, the welding of special steel is a major problem that we are about to face, but the ordinary resistance welding process cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high-phosphorus steel. :
[0003] 1. Since the temperature during resistance welding is very high, this welding process will cause the temperature of the welding area to rise and fall suddenly, resulting in quenching of the weld seam and heat-affected zone, and the weld seam and heat-affected zone after quenching will obviously appear Irregular coarse crystals (especially 400 series stainless steel, high-strength alloy steel and high-phosphorus steel, etc.), so that the weld and heat-affected zone will break once they are stressed;
[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

Method used

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  • Resistance welding technology with online continuous weld heat treatment
  • Resistance welding technology with online continuous weld heat treatment
  • Resistance welding technology with online continuous weld heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A resistance welding machine with on-line continuous weld seam heat treatment, including a welding trolley 1, and a shearing device 2, a resistance 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 resistance welding device 3 is provided with a preheating device 5 that can perform online continuous temperature rise and preheating of the welding area, and the preheating device 5 is arranged between the shearing device 2 and the resistance welding device 3, The position corresponding to the rear of the resistance welding device 3 on the welding trolley 1 is provided with a heat treatment device 6 capable of performing online 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...

Embodiment 2

[0050] 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):

[0051] A resistance welding process with on-line continuous weld seam heat treatment, comprising the following steps:

[0052] 1) The on-line strip steel is cut and stitched by the shearing device 2 on the shearing station of the welding process;

[0053] 2) After the shearing and jointing is completed, the welding area of ​​the on-line strip steel is preheated to 150-200° C. through the preheating device 5 on the preheating station of the welding process;

[0054] 3) After heating up and preheating, the online strip steel is welded by the resistance welding device 3 on the welding station of the welding process;

[0055] 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 ...

Embodiment 3

[0061] Embodiment 3 (specifically for 400 series stainless steel):

[0062] A resistance welding process with on-line continuous weld seam heat treatment, comprising the following steps:

[0063] 1) The on-line strip steel is cut and stitched by the shearing device 2 on the shearing station of the welding process;

[0064]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;

[0065] 3) After heating up and preheating, the online steel strip is welded by the resistance welding device 3 on the welding station of the welding process;

[0066] 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 temperat...

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Abstract

The invention discloses a resistance welding technology with online continuous weld heat treatment. The method comprises the following steps: (1) The online strip steel is sheared and seamed in the shearing station of the welding process. (2) After shearing and seaming, the welding area of the online strip steel is online continuously preheated by the preheating device in the preheating station of the welding process. (3) After preheating, the online strip steel is welded in the welding station of the welding process. (4) After welding, the welding area of online strip steel is online continuously welded and normalized by the normalizing mechanism in the normalizing station of the welding process. (5) After normalizing, the welding area of the online strip steel is online continuously welded and rolled by the rolling device in the rolling station of the welding process. (6) After rolling, the welding area of the online strip steel is online continuously welded and tempered by the tempering mechanism in the tempering station of the welding process or online continuously welded and taken brittle processing by the brittle processing device in the brittle processing station of the brittle processing process. The resistance welding technology with online continuous weld heat treatment is suitable for welding.

Description

technical field [0001] The invention relates to the field of welding, in particular to a resistance welding process with on-line continuous weld seam heat treatment. 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 ordinary resistance welding process cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high-phosphorus steel. : [0003] 1. Since the temperature during resistance welding is very high, this welding process will ca...

Claims

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Application Information

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IPC IPC(8): B23K11/087B23K11/16B23K11/36B23K101/16B23K103/04
CPCB23K11/002B23K11/087B23K11/16B23K11/36
Inventor 陈俊熊辉桂敏敏张同德张炼芦洪波殷明芦立楷
Owner WUHAN KAIQI SPECIAL WELDING EQUIP
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