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Diffusion welding technology of activity increasing intermediate layer of iron trialuminium alloy and steel

An active intermediate layer, iron-tri-aluminum-based technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as limited scope of application, and achieve the goal of improving bonding strength, promoting diffusion bonding, and increasing contact area Effect

Inactive Publication Date: 2006-07-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only iron-tri-aluminum-based alloys containing 4.45% Cr and 1.0% Nb, under the condition of strictly controlling the welding speed (v=4.2~8.5mm / s) and welding heat energy, strict preheating before welding and slow welding after welding are adopted. Cold and other process measures can avoid welding cracks, so the scope of application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: The process steps are: prepare titanium with a purity >99% into a titanium foil with a thickness of 20 μm by pressing; pickle the surface of a carbon steel with a diameter of φ50×2 mm for 8 minutes, and then polish it with sandpaper until a metallic luster appears. Soak in acetone solution for 10 minutes, then scrub the surface of iron-tri-aluminum-based alloy with a diameter of φ50×3mm and the surface of carbon steel soaked in acetone with alcohol; sandwich the prepared active intermediate layer with a thickness of 20 μm titanium foil on the iron-tri-aluminum alloy The contact surface of the aluminum-based alloy and carbon steel to be welded; then place the iron-tri-aluminum-based alloy and carbon steel assembly with an active intermediate layer in the vacuum chamber of vacuum diffusion welding, and press it with the upper and lower chucks, It is required that the entire combined weldment is parallel to the contact surface of the indenter. The process parame...

Embodiment 2

[0017] Embodiment 2: The process steps are: the niobium with a purity > 99% is prepared into a niobium foil with a thickness of 10 μm by pressing; the surface of the 1Cr18Ni9Ti stainless steel with a test plate size of 100 mm × 40 mm × 5 mm is pickled for 5 minutes, and then polished to After the metallic luster appears, soak in acetone solution for 10 minutes, and then scrub the surface of the iron-tri-aluminum-based alloy with a size of 100mm×40mm×5mm and the stainless steel surface soaked in acetone with alcohol; the thickness of the prepared active intermediate layer is 10μm The niobium foil is clamped on the contact surface of the iron-tri-aluminum-based alloy and stainless steel to be welded; The collet is pressed tightly, requiring the entire combined weldment to be parallel to the contact surface of the indenter. The process parameters of diffusion welding are: vacuum degree 4.5×10 -4 Pa, welding temperature 1030℃, holding time 35min, welding pressure 13.5MPa, slow co...

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Abstract

A diffusion welding technology for Fe3Al alloy and steel includes such steps as mechanically and chemically treating the surfaces to be welded of Fe3Al alloy and steel, adding an active layer between them, putting them in a vacuum chamber, and diffusion welding.

Description

(1) Technical field [0001] The invention relates to a welding process for iron-tri-aluminum-based alloy and steel, and belongs to the field of welding technology. (2) Background technology [0002] The welding of iron-tri-aluminum-based alloy and steel is realized by adding an active intermediate layer diffusion welding process, and this method is especially suitable for welding dissimilar materials of iron-tri-aluminum-based alloy under heat-resistant and anti-corrosion conditions. [0003] Iron-tri-aluminum-based alloys have good oxidation resistance, corrosion resistance and good wear resistance, and can be widely used in engineering structures such as electric power construction, petrochemical industry, and nuclear power plants. The composite structure made by welding iron-tri-aluminum-based alloy with carbon steel and stainless steel can give full play to the respective performance advantages of the two materials and greatly improve the service life of the structure and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/14B23K20/22
Inventor 李亚江王娟张永兰刘鹏
Owner SHANDONG UNIV
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