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Fusion welding process for iron and aluminum-base alloy and stainless steel by taking Fe-Cr-Ni alloy as filling material

A fe-cr-ni, filling material technology, used in metal processing equipment, welding/cutting media/materials, welding equipment, etc. Moderate heat and welding current, ensuring the effect of mechanical properties

Inactive Publication Date: 2013-08-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of Cr-Mo steel welding wire or electrode as filler material can ensure the mechanical properties of welded joints, due to the low Cr content (0.5% to 2.0%, mass percentage), the heat resistance and corrosion resistance of the weld metal are poor. Susceptible to failure at welds in hot, acidic environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Butt welding of an iron-aluminum-based alloy workpiece with a length of 180 mm, a width of 110 mm and a thickness of 10 mm and a ferritic stainless steel sheet workpiece (2Cr13), using a nickel-based electrode with a diameter of 3.2 mm (ENiCrMo-0) Bottom welding, ultra-low carbon Cr25Ni13Mo2 stainless steel electrode (E309MoL-16) cover welding, the process steps are:

[0030] (1) Use a manual grinding wheel to grind the surface of the joint between the iron-aluminum-based alloy workpiece and the ferritic stainless steel plate workpiece to reveal a metallic luster, and grind the butt joint of the workpiece into a V-shaped groove of about 60°, with a blunt edge of 3mm;

[0031] (2) The chemical composition of the nickel-based backing electrode (ENiCrMo-0) is calculated as mass percentage: C 0.04% 5%, Cr 15%, Ni 70%, Mo 4%, Nb 4, and the rest is Fe; The mass percentage of the chemical composition of the layered Cr25Ni13Mo2 ultra-low carbon stainless steel electr...

Embodiment 2

[0035] Example 2: Butt welding of an iron-aluminum-based alloy workpiece with a length of 160 mm, a width of 100 mm and a thickness of 6 mm and an austenitic stainless steel plate (1Cr18Ni9Ti) workpiece, using a nickel-based electrode (ENiCrMo-0) with a diameter of 3.2 mm Bottom welding, ultra-low carbon Cr25Ni13Mo2 stainless steel electrode (E309MoL-16) cover welding, the process steps are:

[0036] (1) Use a manual grinding wheel to grind the surface of the workpiece joint of the iron-aluminum-based alloy workpiece and the 1Cr18Ni9Ti stainless steel plate workpiece to reveal a metallic luster, and grind the butt joint of the workpiece into a V-shaped groove of about 60°, with a blunt edge of 3mm;

[0037] (2) The chemical composition of the nickel-based backing electrode (ENiCrMo-0) is calculated as mass percentage: C 0.04% 5%, Cr 15%, Ni 70%, Mo 4%, Nb 4, and the rest is Fe; The mass percentage of the chemical composition of the layered Cr25Ni13Mo2 ultra-low carbon stainles...

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PUM

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Abstract

The invention discloses a fusion welding process for an iron and aluminum-base alloy and stainless steel by taking a Fe-Cr-Ni alloy as a filling material. The fusion welding process comprises the steps as follows: 1) machining the surfaces of an iron and aluminum-base alloy plate workpiece and a stainless steel plate workpiece which are to be welded so as to remove oxidation films, oil stains and corrosions on the surfaces of the workpieces to be welded; and 2) assembling the iron and aluminum-base alloy plate workpiece and the stainless steel plate workpiece into a butt joint, and carrying out electric-arc welding under non-preheating condition at room temperature, wherein the electric-arc welding process comprises the steps of carrying out backing welding by a nickel-base electrode and carrying out cosmetic welding by an ultralow-carbon Cr25Ni13Mo2 stainless steel electrode. A direct-current inversion electric-arc welding machine is adopted to perform the welding operation in the step 2), the application range is wide, the electric-arc welding of the iron and aluminum-base alloy and stainless steel electrodes with no cracks and higher bonding strength under room temperature can be achieved, the tensile strength of a welding joint obtained by the process reaches 720 MPa, and the usage requirements of the fusion welding joint of the iron and aluminum-base alloy and the stainless steel in anti-wear and anti-corrosion occasions can be met.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a welding method for dissimilar metals, in particular to a fusion welding process of an iron-aluminum-based alloy and stainless steel using Fe-Cr-Ni alloy as a filling material. Background technique [0002] Iron-aluminum-based alloys have high high-temperature specific strength, specific stiffness, and excellent high-temperature oxidation, vulcanization and corrosion resistance, and their specific gravity is low and the cost of use is relatively low. The development prospect is a wear-resistant, heat-resistant and corrosion-resistant structural material with great application potential. As an important means of manufacturing structural materials, welding is a key process for the promotion and application of iron-aluminum-based alloys. However, iron-aluminum-based alloys have high brittleness and poor weldability, and are prone to hot and cold cracks during fusion welding. Althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/235B23K33/00B23K35/30
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV