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Electron beam welding method of cast superalloy and martensitic stainless steel

A martensitic stainless steel, electron beam welding technology, applied in electron beam welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as macroscopic cold cracks, achieve internal stress elimination, strong operability, and good weld quality Effect

Active Publication Date: 2021-09-28
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the electron beam welding of cast superalloy and martensitic stainless steel is easy to produce macroscopic cold cracks, and provide a method for electron beam welding of cast superalloy and martensitic stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The welding base metal is two plates with a thickness of 3.5-4.5mm. The material types of the plates are K423 superalloy and 1Cr12Ni3MoV stainless steel. The specific steps are:

[0033] 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.

[0034] Step 2: Use a concentration of 4% HF+4% HNO 3 +92%H 2 O solution to wipe the welding surface to remove surface oxides.

[0035] Step 3: Clamp the weldment with a non-magnetic or demagnetized fixture whose surface has been cleaned. The fixture only applies clamping force in the direction parallel to the weld of the weldment. The local gap at the weld joint must not exceed 0.08mm. Not more than 0.75mm.

[0036] Step 4: Vacuumize to a vacuum of 4×10 -3 up to 6×10 -3 Pa, use defocus to preheat the weld seam and surrounding parts, the acceleration voltage is 60kV, the electron beam current is 5-10mA, the focusing cu...

Embodiment 2

[0042] The welding base materials are two plates with a thickness of 4.5-6.0mm, and the material types are K423 superalloy and 1Cr12Ni3MoV stainless steel respectively. The difference between the welding method and Example 1 is:

[0043] Step 4: Vacuumize to a vacuum of 4×10 -3 up to 6×10 -3 Pa, use defocus to preheat the weld seam and surrounding parts, the acceleration voltage is 60kV, the electron beam current is 5-12mA, the focusing current is 2250mA, and the welding speed is 300-600mm / min.

[0044] Step 5: Immediately after the completion of step 4, welding is performed, the accelerating voltage is 60kV, the electron beam current is 40-50mA, the focusing current is 1830mA, and the welding speed is 600-1000mm / min.

[0045] Step 6: Move the focus position of the electron beam to the side of the cast superalloy plate by 0.5-1.1mm, and then start the second welding. The acceleration voltage of this welding is 60kV, the electron beam current is 30-40mA, and the focusing curre...

Embodiment 3

[0048] The welding base materials are two plates with a thickness of 6.0-8.0mm, and the material types are respectively K423 superalloy and 1Cr12Ni3MoV stainless steel. The difference between the welding method and Example 1 is:

[0049] Step 4: Vacuumize to a vacuum of 4×10 -3 up to 6×10 -3Pa, use defocus to preheat the weld seam and surrounding parts, the acceleration voltage is 60kV, the electron beam current is 5-15mA, the focusing current is 2250mA, and the welding speed is 300-600mm / min.

[0050] Step 5: Immediately after the completion of step 4, welding is performed, the accelerating voltage is 60kV, the electron beam current is 50-65mA, the focusing current is 1830mA, and the welding speed is 600-1000mm / min.

[0051] Step 6: Move the focus position of the electron beam to the side of the cast superalloy plate by 0.5-1.5mm, and then start the second welding. The speed is 600-900mm / min.

[0052] After fluorescence inspection, no defects such as cracks and pores were ...

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Abstract

An electron beam welding method for cast superalloy and martensitic stainless steel, which removes the surface oxides of two welding base metals; clamps the two welding base metals with a clamp, and clamps the welding base metal in a direction parallel to the weld seam. Tightening force; under vacuum, use defocusing to preheat the weld seam and surrounding parts before welding; then move the electron beam focus position to the side of the cast superalloy plate by 0.5‑1.5mm, and then perform secondary welding. The invention has simple process and strong operability, and can implement welding without adding special equipment or adding transition layer metal. In addition, defocusing preheating before welding can eliminate internal stress, and secondary welding can perform post-weld heat treatment to improve the mechanical properties of joints and avoid macroscopic cracks. After the method of the invention is used for welding, no defects such as cracks and pores are found in the weld seam through fluorescence and X-ray inspection, and the weld seam quality is good.

Description

technical field [0001] The invention belongs to the field of melting and welding of dissimilar materials, and relates to an electron beam welding method of cast superalloy and martensitic stainless steel. Background technique [0002] Cast superalloys are metal structural materials that can work stably for a long time in high temperature and oxidative corrosion environments. The most important use in the aviation industry is to manufacture aeroengine turbine blades, guide vanes, turbine disks and other parts. Martensitic stainless steel has high thermal strength, not only high instantaneous strength at medium temperature, but also good medium temperature durability, creep resistance, stress corrosion resistance and cold and heat fatigue performance, suitable for manufacturing compressor blades, compressor discs, turbine shafts and other parts. The use of mechanical structures such as bolts and mortise teeth to connect the two materials increases the complexity of the struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/00
CPCB23K15/0033B23K15/0046
Inventor 周中波薛国强张利军薛祥义吴天栋刘娣
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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