Friction welding method for cast super alloy and martensite stainless steel

A martensitic stainless steel and superalloy technology, applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve problems such as poor weldability, brittle phase precipitation, and increased alloy crack sensitivity, and achieve strong operability and process. Simple, good weld quality results

Inactive Publication Date: 2020-01-10
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology allows for better control over how well it works during weld joining processes compared to previous methods that had certain disadvantages like complicated procedures and high costs associated therewith. By performing this technique, we have achieved stronger connections between materials than previously possible due to its simplicity and ease of use. Additionally, while traditional techniques may result in weakened areas caused by added layers, our innovation improves upon them. Overall, these technical improvements make weldings more reliable and efficient.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the quality control (QC) of castings made from alloys containing chromium or molybdenum, particularly when they have large dimensions due to their ability to resist damage caused during operation under harsh conditions like extreme environmental factors including high altitude air pollution levels and severe operating environment. Current methods involve expensive machining processes involving multiple steps and complex material compositions, leading to imperfections such as pitting holes and lack of bond between different metals. There is an urgent desire to develop better ways to join these types of materials together without compromising on their overall effectiveness.

Method used

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  • Friction welding method for cast super alloy and martensite stainless steel
  • Friction welding method for cast super alloy and martensite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The welding base material is 1Cr12Ni2WMoVNb stainless steel and K405 superalloy pipe fittings with a wall thickness of 10-15mm. The specific steps are:

[0030] Step 1: Use acetone or alcohol to clean the parts to be welded before welding to ensure that the surface is free of oil, paint, foreign debris and other pollutants.

[0031] Step 2: Clamp the cast superalloy and the martensitic stainless steel bar on the moving fixture and the rotating fixture of the friction welding machine respectively.

[0032] Step 3: Perform the first-stage friction welding with a rotating speed of 1500r / min, a friction pressure of 1MPa, and a friction time of 6s.

[0033] Step 4: After step 3, perform the second-stage friction welding with a friction pressure of 8.5MPa and a friction time of 20s.

[0034] Step 5: Immediately after the end of step 4, brake and apply a 10MPa upsetting pressure for 60s.

[0035] Step 6: Clear the internal and external flash of the weldment.

[0036] After f

Embodiment 2

[0038] The welding base material is 1Cr12Ni2WMoVNb stainless steel and K417 superalloy pipe fittings with a wall thickness of 10-15mm. The difference between the welding method and Example 1 is:

[0039] Step 4: After step 3, perform the second-stage friction welding with a friction pressure of 8.7MPa and a friction time of 21s.

[0040] Step 5: Immediately after the end of step 4, brake and apply 12MPa upsetting pressure for 60s.

[0041] After fluorescence inspection, no defects such as cracks and pores were found in the weld area, and the tensile strength of the joint was σ b It is 853MPa.

Embodiment 3

[0043] The welding parent material is 1Cr12Ni2WMoVNb stainless steel and K423 superalloy pipe fittings with a wall thickness of 10-15mm. The difference between the welding method and Example 1 is:

[0044] Step 3: Perform the first-stage friction welding with a rotating speed of 1500r / min, a friction pressure of 1MPa, and a friction time of 7s.

[0045] Step 4: After step 3, perform the second-stage friction welding with a friction pressure of 9.0MPa and a friction time of 22s.

[0046] Step 5: Immediately after the end of step 4, brake and apply 12MPa upsetting pressure for 60s.

[0047] After fluorescence inspection, no defects such as cracks and pores were found in the weld area, and the tensile strength of the joint was σ b It is 866MPa.

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PUM

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Abstract

The invention discloses a friction welding method for cast super alloy and martensite stainless steel. The cast super alloy and a martensite stainless steel bar are clamped by a movable fixture and arotary fixture of a friction welding machine correspondingly, during rotation, primary friction welding is conducted under low pressure, then, secondary friction welding is conducted under high pressure, and finally, upset forging is conducted. According to the friction welding method, the technology is simple, the operability is high, and welding can be conducted without adding special equipmentor transition layer metal. The primary friction welding has the pre-cleaning effect, an oxidation film on a welding surface is damaged, internal pure metal is exposed, meanwhile, heat generated through friction can enable the temperature of a welding surface to be increased, and a plastic deformation layer is formed. In addition, in the upset forging process, a welding connector can be further forged, and a welding connector compact in structure and good in mechanical property is formed. After welding is conducted through the friction welding method, cracks, pores and other defects are not found at a welded seam after fluorescent inspection, and the quality of the welded seam is good.

Description

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Claims

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Application Information

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Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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