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Welding material for high-temperature long-time service and welding method thereof

A welding material and welding method technology, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of low tensile strength, poor impact resistance, etc., to reduce thermal stress, high temperature tensile strength Strength and impact resistance, the effect of preventing deformation

Active Publication Date: 2019-05-03
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current conventional 316 welded joints have the disadvantages of low tensile strength and poor impact resistance after high-temperature stress-relieving heat treatment. The absorption energy can only reach about 30-40J, and the impact toughness can only reach about 15-20J after 40 years of accelerated aging heat treatment under simulated high-temperature conditions.

Method used

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  • Welding material for high-temperature long-time service and welding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A welding material suitable for long-term service under high temperature conditions. The welding material includes an argon arc welding wire for bottom welding and an electrode for filling and covering. The argon arc welding wire includes the following components by weight: C: 0.032%, Cr: 18.80%, Ni: 12.50%, Mo: 2.38%, Mn: 1.80%, Si: 0.45%, P: 0.015%, S: 0.005%, Cu: 0.02%, N: 0.085%, Co: 0.02%, Fe is the balance. The ferrite content of the welding wire was 4.2FN.

[0042] The electrode includes the following components by weight: C: 0.035%, Cr: 19.60%, Ni: 12.83%, Mo: 2.25%, Mn: 1.56%, Si: 0.33%, P: 0.011%, S: 0.005 %, Cu: 0.02%, N: 0.080%, Co: 0.02%, Fe is the balance; the ferrite content of the electrode is 4.2FN.

[0043] A welding method for welding materials suitable for long-term service under high temperature conditions, the specific steps and process parameters are as follows:

[0044] (1) Pretreatment: All the grooves of the workpieces to be welded are proce...

Embodiment 2

[0050] A welding material suitable for long-term service under high temperature conditions. The welding material includes an argon arc welding wire for bottom welding and an electrode for filling and covering. The argon arc welding wire includes the following components by weight: C: 0.045%, Cr: 19.20%, Ni: 11.89%, Mo: 2.30%, Mn: 2.0%, Si: 0.48%, P: 0.012%, S: 0.006%, Cu: 0.02%, N: 0.075%, Co: 0.02%, Fe is the balance. The ferrite content of the welding wire was 5.0FN.

[0051] The electrode includes the following components by weight: C: 0.051%, Cr: 19.09%, Ni: 11.63%, Mo: 2.38%, Mn: 1.90%, Si: 0.32%, P: 0.012%, S: 0.004 %, Cu: 0.04%, N: 0.072%, Co: 0.02%, Fe is the balance; the ferrite content of the electrode is 5.0FN.

[0052] A welding method for welding materials suitable for long-term service under high temperature conditions, the specific steps and process parameters are as follows:

[0053] (1) Pretreatment: All the grooves of the workpieces to be welded are proces...

Embodiment 3

[0059] A kind of welding material suitable for long-term service under high temperature conditions. The welding material includes argon arc welding wire for bottom welding and welding rod for filling and covering. The argon arc welding wire includes the following components by weight: C: 0.058%, Cr: 19.15%, Ni: 11.35%, Mo: 2.15%, Mn: 1.5%, Si: 0.52%, P: 0.010%, S: 0.008%, Cu: 0.02%, N: 0.055%, Co: 0.02%, Fe is the balance, and the ferrite content of the welding wire is 5.8FN.

[0060] The welding rod includes the following components by weight: C: 0.058%, Cr: 19.45%, Ni: 11.65%, Mo: 2.15%, Mn: 1.59%, Si: 0.52%, P: 0.010%, S: 0.008%, Cu : 0.02%, N: 0.055%, Co: 0.02%, Fe is the balance; the ferrite content of the electrode is 6.0FN.

[0061] A welding method for welding materials suitable for long-term service under high temperature conditions, the specific steps and process parameters are as follows:

[0062] (1) Pretreatment: All the grooves of the workpieces to be welded ar...

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Abstract

The invention relates to the field of welding technologies. At present, the dimensions of a part easily change in case of long-time service in a high-temperature environment. The following technical solution is adopted: the welding material comprises an argon arc welding wire and a welding rod, and the welding rod contains the following components in parts by weight: 0.03-0.06% of C, 18.0-20.0% ofCr, 11.0-13.0% of Ni, 2.0-2.5% of Mo, 1.0-2.5% of Mn, less than or equal to 0.90% of Si, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.75% of Cu, 0.04-0.09% of N, less than or equal to 0.15% of Co, and the balance of Fe. The invention also provides a welding method. The welding method comprises the following steps: pre-processing a workpiece first;performing backing welding; performing filling welding; performing covering welding; and performing heat treatment on a welded joint to finish welding. The welding material has relatively high tensilestrength and impact resistance, can resist corrosion and is relatively long in service life.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding material suitable for high-temperature service for a long time and a welding method thereof. Background technique [0002] Due to the high requirements of fast reactor pump shafts and other equipment, the service temperature of the equipment is usually ≥355°C, and the extreme working condition is 550°C, and these workpieces need to serve for at least 40 years at this temperature, and these workpieces are usually 316 austenitic The body is made of stainless steel, with a length of about 12m and a diameter of about 700mm. There is a hollow section in the middle, and the sections are connected by welding. Since the parts and the slender hollow shaft need to continue to rotate at high speed in a high temperature environment, the dimensional stability of the workpiece is highly required. During the long-term service, the dynamic balance accuracy level must meet G2.5, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/00B23K9/16C22C38/58C22C38/52C22C38/48C22C38/44C22C38/42C21D1/30C21D1/74C21D1/613C21D9/50
Inventor 刘金湘俞增强孙凡宋磊陈锐任志华祁世让胡玲翠濮炼杰郑胜赶贺彦鹏
Owner CHINA INSTITUTE OF ATOMIC ENERGY