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Iron and aluminum intermetallic compound and steel impulse fusion welding method

A technology of intermetallic compounds and pulses, which is applied in the field of welding between dissimilar materials, fusion welding between iron-aluminum intermetallic compounds and carbon steel dissimilar materials, and can solve the problem of reducing the mechanical properties of the joint area, limiting the scope of application, and coarse tissue, etc. problems, to achieve the effect of eliminating the formation of pores and brittle phases in the fusion zone, convenient operation, and excellent structural properties

Inactive Publication Date: 2008-06-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When electron beam welding is used, since the welding process is carried out in a vacuum, the harmful effect of hydrogen is suppressed, and the concentrated heat input refines the structure of the welding fusion zone, which can avoid the generation of welding cracks, but the equipment of this method is expensive, Only suitable for welding thin parts of iron-aluminum intermetallic compounds
When argon tungsten arc welding is used, the alloy composition and welding process parameters have a great influence on the microstructure and properties of the welded joints of iron-aluminum intermetallic compounds. Only when the welding speed (0.42-0.85cm / s) and welding heat input are strictly controlled Under certain conditions, strict pre-weld preheating, post-weld slow cooling and other process measures can avoid welding cracks, so the scope of application is limited
Diffusion welding of iron-aluminum intermetallic compounds must be kept for a long time under high temperature and high vacuum conditions (for example, heating temperature 1040-1060 ° C, holding time greater than 60 minutes), but this process condition can easily lead to coarse tissue near the interface, reducing the joint area. mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For the butt welding of the iron-aluminum intermetallic compound with a length of 160mm, a width of 70mm, and a thickness of 4mm and a 1Cr18Ni9Ti stainless steel plate, the process steps of pulse tungsten argon arc welding using a Cr25Ni13Mo2Nb alloy wire with a diameter of 1.6mm as the filler metal are as follows:

[0021] (1) Use a manual grinding wheel to grind the butt joint of the iron-aluminum intermetallic compound and the 1Cr18Ni9Ti stainless steel plate into a V-shaped groove of about 60°;

[0022] (2) First use acetone to remove the oil on the surface of the welding wire, then use a 15% volume percent NaOH solution to clean it for 15 minutes at 25°C±5°C, then rinse it with water and dry it at 60°C.

[0023] (3) Cr25Ni13Mo2Nb austenitic steel welding wire is based on mass percentage, Cr content is 24.5%, Ni content is 13.5%, Mo content is 2.5%, Nb content is 0.85%, and the balance is steel.

[0024] (4) Fix the test plate and weld it with DC positive polarity. ...

Embodiment 2

[0027] For the butt welding of iron-aluminum intermetallic compounds with an outer diameter of 116mm, a wall thickness of 6mm, and a length of 180mm with Q235 low-carbon steel pipe fittings, the pulse tungsten argon arc welding of Cr25Ni13Mo2Nb alloy wire with a diameter of 2.0mm is used as the filler metal. The process steps are:

[0028] (1) Use a self-rotating beveling machine to grind the butt joint of the iron-aluminum intermetallic compound and the Q235 low-carbon steel pipe into a single-sided V-shaped bevel of about 60°;

[0029] (2) First use acetone to remove the oil on the surface of the welding wire, then use a 15% volume percent NaOH solution to clean it for 15 minutes at 25°C±5°C, then rinse it with water and dry it at 60°C.

[0030] (3) Cr25Ni13Mo2Nb austenitic steel welding wire is based on mass percentage, Cr content is 25.5%, Ni content is 13.5%, Mo content is 2.5%, Nb content is 0.85%, and the balance is steel.

[0031] (4) Spot-fix the pipe fittings betwee...

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Abstract

The invention discloses a method for fusion-welding iron-aluminum inter-metallic compounds and steel through pulses. The invention adopts Cr25Ni13Mo2Nb austenite steel welding wires as filling materials and inertia gas protection. The invention takes argon tungsten pulsed arc welding to weld the iron-aluminum inter-metallic compounds and carbon steel or stainless steel. The diameter of the austenite steel welding wires is 1.6-3.0 mm, the inertia gas protection is argon, the processing parameters of the argon tungsten pulsed arc welding are that base current is 70A-180A, pulse current is 100A-250A, pulse duration is 0.15s-0.60s, welding voltage is 12V-18V, argon flow is 10L / min-16L / min, the argon flow of back protecting gas is 2L / min-5L / min, and distance between a jet of a welding torch and a component is 6mm-12mm. The invention can weld the iron-aluminum inter-metallic compounds and the dissimilar materials of the steel to obtain welding connectors with non-cracks and non brittle phases under the condition of non-heating. The invention has the advantages of strong applicability, convenient operation, the invention is convenient for popularization and application, the invention is in particular suitable for welding the iron-aluminum inter-metallic compounds and the carbon steel or the stainless steel, and applied to weld the iron-aluminum inter-metallic compounds and other low-alloy structural steel and heat resistant steel.

Description

1. Technical field: [0001] The invention relates to a welding method between dissimilar materials, in particular to a fusion welding method between an iron-aluminum intermetallic compound and carbon steel (or stainless steel) dissimilar materials, and belongs to the field of welding technology. 2. Background technology: [0002] With the development of science and technology, it is difficult for a single material to meet the comprehensive performance requirements of modern engineering structures, and new dissimilar material welded structures have attracted widespread attention. The strength properties of conventional materials generally decrease with the increase of temperature, and iron-aluminum intermetallic compounds (such as Fe 3 Al) on the contrary, its strength performance does not decrease (or even increases) with the increase of temperature. This abnormal temperature-strength relationship has attracted great attention. Iron-aluminum intermetallic compounds have good...

Claims

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Application Information

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IPC IPC(8): B23K9/09B23K9/16B23K103/20
Inventor 李亚江王娟马海军夏春智
Owner SHANDONG UNIV
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