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Butt joint welding process of device opening with nickel-based isolation layer and heat-resistant steel pipeline

A technology of welding process and isolation layer, which is applied in the field of butt welding process between equipment port with nickel-based isolation layer and heat-resistant steel pipe, which can solve the problems of side bending fracture and low yield of welded parts

Inactive Publication Date: 2019-03-26
陕西化建工程有限责任公司
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Problems solved by technology

[0003] The object of the present invention is to provide a butt welding process between the equipment port with a nickel-based isolation layer and a heat-resistant steel pipe, which uses nickel-based welding consumables for welding, and heat treatment after welding, which solves the problem of using traditional welding methods for such materials. The technical problem that almost all the side bends are broken and the yield is extremely low

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  • Butt joint welding process of device opening with nickel-based isolation layer and heat-resistant steel pipeline
  • Butt joint welding process of device opening with nickel-based isolation layer and heat-resistant steel pipeline
  • Butt joint welding process of device opening with nickel-based isolation layer and heat-resistant steel pipeline

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Embodiment Construction

[0023] A butt welding process between the equipment port with a nickel-based isolation layer and a heat-resistant steel pipe. The nickel-based welding material is used for welding, and then heat treatment is performed after welding; the temperature of the heat treatment is 700~750°C, and the time is more than 2 hours. The time is calculated based on the wall thickness of the material. The calculation standard is 2.4 minutes per millimeter of thickness, and the calculated minimum heat preservation is not less than 2 hours.

[0024] The specific situation for welding nickel-based welding consumables is as follows:

[0025] Grind off the isolation layer of the equipment port to make both ends of the chrome-molybdenum steel and then weld.

[0026] The second specific situation for welding nickel-based welding consumables is:

[0027] Surfacing nickel-based welding consumables for heat-resistant steel pipes. After heat treatment, there are nickel-based welding consumable isolation...

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Abstract

The invention provides a butt joint welding process of a device opening with a nickel-based isolation layer and a heat-resistant steel pipeline. Nickel-based welding material welding is performed, andheat treatment is performed after welding; the heat treatment temperature is 700-750 DEG C, time is 2 hours or above, and the time is worked out according to the material wall thickness; according tothe calculating standard, heat preserving is performed for 2.4 min for every millimeter of thickness; and it is worked out that lowest heat preserving is not lower than 2 hours. According to the process, nickel-based welding material welding is adopted, heat treatment is performed after welding, and the technical problem that a traditional welding manner is adopted for the material, the welding process test is not qualified is solved.

Description

technical field [0001] The object of the present invention is to provide a welding process, in particular to a butt welding process between an equipment port with a nickel-based isolation layer and a heat-resistant steel pipeline. Background technique [0002] At this stage, when the equipment port with nickel-based isolation layer is connected with carbon steel, stainless steel, and heat-resistant steel pipes, the welding process usually used is welding with the same welding material as the nickel-based surfacing layer. However, this year, our company Shandong Sheng In the 1.8 million tons / year hydrocracking project of Star Chemical Co., Ltd., 12Cr2Mo1(Ⅲ) groove surfacing welding 6mmENiCrMo-3 electrode / A335P11 and 15CrMo(Ⅲ) groove surfacing welding 6mmENiCrMo-3 electrode / A335 P11 equipment mouth welding were encountered. The previous welding method was used for direct welding, and all fractures occurred in the side bending test in the process qualification test. We conducte...

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Application Information

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IPC IPC(8): B23K9/16B23K9/23
CPCB23K9/16B23K9/23
Inventor 李琳马文军汪小华南亚群高宝宝
Owner 陕西化建工程有限责任公司
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