A process for welding high strength steel penetrations with austenitic weld material

By employing composite bevel design, multi-layer welding, and vibration aging treatment, the problems of fusion and bonding force when welding high-strength steel through-hole components with austenitic welding materials were solved, achieving efficient welding of high-strength steel through-hole components and meeting the service standards of high-end equipment.

CN122353018BActive Publication Date: 2026-09-11CHINA SHIPBUILDING INDUSTRY CORPORATION NO725 RESEARCH INSTITUTE
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Patent Information

Application Number
CN202610846665.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-06-12
Publication Date
2026-09-11
Estimated Expiration
2046-06-12

AI Technical Summary

Technical Problem

When welding high-strength steel through-hole components with existing austenitic welding materials, the weld has poor fusion with the high-strength steel matrix and weak interfacial bonding force. This results in the joint's tensile strength and resistance to low-temperature brittle fracture not meeting the standards at the same time, and it is prone to welding defects, making it difficult to meet the stringent service standards of high-end equipment.

Method used

By employing a composite bevel design, multi-layered welding process, and vibration aging treatment, combined with austenitic welding materials, the welding process is optimized, improving fusion and crack resistance, reducing cold crack sensitivity, and simplifying the heat treatment process.

Benefits of technology

It improves the tensile strength and resistance to low-temperature brittle fracture of welded joints, reduces cold cracking sensitivity, simplifies the process, reduces energy consumption, increases first-pass yield, and is suitable for industrial mass production.

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Abstract

This invention relates to the field of welding technology, and provides a process for welding high-strength steel through-hole components using austenitic welding materials. The process includes: Step 1, pre-welding treatment: machining a composite bevel at the through-hole location in the high-strength steel substrate, the composite bevel consisting of an outer V-shaped bevel and an inner U-shaped bevel; Step 2, assembly and positioning: embedding the through-hole component into the through-hole of the high-strength steel substrate; Step 3, selection of welding materials: using austenitic welding materials; Step 4, layered welding: using tungsten inert gas (TIG) welding for the root pass, and manual arc welding for the fill and cover passes; Step 5, post-weld treatment: performing slow cooling and surface treatment after welding, and finally vibration aging treatment. The process for welding high-strength steel through-hole components using austenitic welding materials described in this invention results in good fusion between the weld and the high-strength steel substrate, strong interfacial bonding, and joint tensile strength and resistance to low-temperature brittle fracture simultaneously meeting standards, with no welding defects, thus meeting the stringent service standards of high-end equipment.
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