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Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint

A technology of low-temperature impact toughness and low-carbon martensite, applied in welding medium, welding equipment, welding equipment, etc., can solve the problem that the impact toughness of weld seam is difficult to meet the requirements, and achieve the effect of strong operability and simple process

Inactive Publication Date: 2012-11-28
KOCEL GROUP +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact toughness of the weld is difficult to meet the requirements. At present, there is no solution to this problem.

Method used

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Embodiment Construction

[0017] A welding method for improving the low-temperature impact toughness of a low-carbon martensitic stainless steel weld, characterized in that the method includes the following steps:

[0018] a. Pre-welding treatment: use a grinder to scrape off the surface of the gouged defect by 1 to 2mm, and use a slag cleaner or a grinding wheel to polish off the welding defect and the carbon black and rust within 200mm around it;

[0019] b. Preheating: use natural gas to preheat, and the preheating temperature is 50-100°C; use a hand-held infrared thermometer for temperature testing;

[0020] c. Welding: use manual arc welding, the electrode material is C≤0.04%, Si≤0.6%, Mn≤1.0%, Cr=12.0~13.5%, Mo=0.4~0.6%, Ni=3.8~5.0%, using φ5 .0 electrode, the welding current is 160-230A, the voltage is 19-25V, the welding speed is Min10cm / min, the width of the single-pass weld is 6-10mm, the thickness is 3-5mm, and the welding energy is 8.4-10.2 KJ / cm, interlayer temperature is 150~200℃;

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Abstract

The invention relates to a welding process, and in particular relates to a welding method for improving the low-temperature impact toughness of a low carbon martensite stainless steel welded joint. The welding method comprises the steps of a pre-welding treatment, a preheating treatment, a welding treatment and an after-welding heat treatment, wherein the temperature of the thermal treatment is 540-570 DEG C. The invention provides a unique process method, the Nieq / Creq equivalence ratio of a welding material is improved based on an original welding process scheme, the energy of a welding wire and foreign carbon leaking into a welded joint are reduced, and simultaneously the post-welding temper temperature is slightly increased.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding method for improving the low-temperature impact toughness of a low-carbon martensitic stainless steel weld seam. Background technique [0002] Due to the special material, difficult pouring technology, and complicated manufacturing process, large blades relied on imports for a long time in the past. At present, through the research and development of some domestic companies, they have basically mastered the production and manufacture of this large-scale equipment. Its material is ZG06Cr13Ni4Mo, which belongs to low carbon martensitic stainless steel. In order to reduce cavitation erosion and sediment wear during blade use, reduce blade fatigue cracks, and increase reliability and stability of power generation efficiency, customers have very strict requirements on the internal and external quality of blades. Main indicators of mechanical properties: tensile strength ≥ 800MPa, 0 ℃ ...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/235B23K35/24
Inventor 马进曹鹏陈得润彭凡张俊勇李文辉李成志马金鑫张立文
Owner KOCEL GROUP
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