Welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel

A technology of austenitic stainless steel and welding technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effect of shortening the construction period, improving efficiency, and good welding performance

Active Publication Date: 2015-07-29
中石化工建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At home and abroad, no matter from the design and actual construction process, it is mainly based on the specification requirements without combining different materials and construction techniques due to differences in work in the specific use process.

Method used

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  • Welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Welding of austenitic stainless steel plate and chromium molybdenum heat-resistant steel plate under hydrogen working condition

[0036] Such as figure 1 As shown, the specific implementation process includes:

[0037] Step 1, pre-welding treatment, including:

[0038] 1) Process the welding joint on the butt joint surface of the austenitic stainless steel plate and the chromium-molybdenum heat-resistant steel plate. The sum of the mouth angles is 44-54 degrees, and the blunt edge is 2.5-3.5mm;

[0039] 2) Grind the groove and blunt edge of the austenitic stainless steel plate and the chromium-molybdenum heat-resistant steel plate, first use 800#-900# sandpaper to remove bright stars, and then use 1500# sandpaper to lightly sand the sand marks , so that the surface roughness is 1.0 to 1.8 μm, cleaning the groove and the blunt edge of the butt joint surface with alcohol to remove the oil stain on the butt joint surface;

[0040] 3) Before using the welding material E...

example 2

[0045] Welding of austenitic stainless steel pipes and chrome-molybdenum heat-resistant steel pipes under hydrogen conditions

[0046] Such as figure 1 As shown, the specific implementation process includes:

[0047] Step 1, pre-welding treatment, including:

[0048] 1) Process the welding joint on the butt joint surface of the austenitic stainless steel pipe material and the chromium-molybdenum heat-resistant steel pipe material. The sum of the mouth angles is 44-54 degrees, and the blunt edge is 2.5-3.5mm;

[0049] 2) Grind the groove and blunt edge of the austenitic stainless steel pipe and the chrome-molybdenum heat-resistant steel pipe, first use 800#-900# sandpaper to remove bright stars, and then use 1500# sandpaper to lightly sand the sand marks , so that the surface roughness is 1.0 to 1.8 μm, cleaning the groove and the blunt edge of the butt joint surface with alcohol to remove the oil stain on the butt joint surface;

[0050] 3) Before using the welding materia...

example 3

[0056] Welding of austenitic stainless steel plate and chromium molybdenum heat-resistant steel plate under non-hydrogen working condition with working temperature greater than 450°C

[0057] Such as figure 1 As shown, the specific implementation process includes:

[0058] Step 1, pre-welding treatment, including:

[0059] 1) Process the welding joint on the butt joint surface of the austenitic stainless steel plate and the chromium-molybdenum heat-resistant steel plate. The sum of the mouth angles is 44-54 degrees, and the blunt edge is 2.5-3.5mm;

[0060] 2) Grind the groove and blunt edge of the austenitic stainless steel plate and the chromium-molybdenum heat-resistant steel plate, first use 800#-900# sandpaper to remove bright stars, and then use 1500# sandpaper to lightly sand the sand marks , so that the surface roughness is 1.0 to 1.8 μm, cleaning the groove and the blunt edge of the butt joint surface with alcohol to remove the oil stain on the butt joint surface; ...

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Abstract

The invention provides a welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel. The welding technology comprises the following steps: processing before welding: processing welding ports on the butt joint surfaces of workpieces, polishing the beveled edges and truncated edges of the butt joint surfaces of workpieces, removing oil contamination on the butt joint surfaces, and removing oil contamination and oxidation film on the surfaces of a welding strip or a welding silk via organic solvent; adopting nickel-based alloy welding silk for executing overlaying treatment on chrome molybdenum heat resistant steel workpiece, adopting manual metal-arc welding or argon tungsten-arc welding for welding; after welding, adopting the air cooling gradient cooling method for cooling the welding ends; removing surface scale and floating dust on the welding ports of the butt joint surfaces, and checking whether the welding ports of the butt joint surfaces have welding problem or not. The leakage problem of connection welding line of the austenitic stainless steel and chrome molybdenum heat resistant steel is solved, ideal different steel welding joint can be obtained and the use performance of the different steel welding welded junction is greatly improved.

Description

technical field [0001] The invention relates to the field of welding technology. More specifically, the present invention relates to the welding process of austenitic stainless steel and chromium-molybdenum heat-resistant steel with excellent characteristics of no cracks in the weld. Background technique [0002] Dissimilar steel welded joints connecting austenitic stainless steel and chromium-molybdenum heat-resistant steel mainly consider the intergranular corrosion, stress corrosion, high-temperature oxidation and high-temperature creep properties of the joints. It is required that the composition of the fusion zone in the welded joint be stable, and the transition layer be It is not obvious, so manual arc welding with small fusion ratio and easy operation is sufficient. In the synthetic circuit composed of channels, the hydrogen partial pressure is as high as 100bar or more. In this system (or circuit), dissimilar steel joints, especially low alloy steel (such as A335GR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/235
CPCB23K9/04B23K9/232B23K9/235
Inventor 孙建国贺淑英黄秀荣张稳平
Owner 中石化工建设有限公司
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