Wire filling tungsten electrode argon-arc welding process for TA15 titanium alloy and austenitic stainless steel

A technology of austenitic stainless steel and tungsten argon arc, applied in arc welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of difficult control of precision, high equipment cost, uneven structure and performance, and avoid high temperature Limitation of performance, reduction of welding cost, wide practical value

Inactive Publication Date: 2012-10-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although titanium and stainless steel can be brazed to obtain joints with certain performance, the service temperature of the joints is low, and the corrosion resistance often cannot meet the high requirements; diffusion bonding of titanium and stainless steel often uses a composite intermediate layer Cu-V or Cu- Mn-Ni can obtain high-strength joints, but the shape and size of the joints are greatly limited, and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Filled tungsten argon arc welding of TA15 titanium alloy and Cr8-Ni8 austenitic stainless steel plate.

[0024] The size of the TA15 titanium alloy plate is 200mm×40mm, and the thickness is 3mm; the size of the Cr8-Ni8 austenitic stainless steel plate is 200mm×80mm, and the thickness is 3mm.

[0025] The first step, preparation before welding of TA15 titanium alloy plate, Cr8-Ni8 austenitic stainless steel plate and pure copper welding wire:

[0026] First process the TA15 titanium alloy plate to be connected to a groove with a groove angle of 45° and a blunt edge of 2 mm; then polish the groove and its surroundings with sandpaper until the metallic luster is exposed;

[0027] Use sandpaper to polish the surface of the Cr8-Ni8 austenitic stainless steel plate to be welded, so that the surface roughness reaches Ra 1.6-3.2;

[0028] Use pure copper welding wire with a diameter of 2.4mm as the filler metal, and use sandpaper to polish the surface of the welding wire until...

Embodiment 2

[0039] Filled tungsten argon arc welding of TA15 titanium alloy and Cr8-Ni8 austenitic stainless steel plate.

[0040] The size of the TA15 titanium alloy plate is 200mm×40mm, and the thickness is 2mm; the size of the Cr8-Ni8 austenitic stainless steel plate is 200mm×80mm, and the thickness is 2mm.

[0041] The first step, preparation before welding of TA15 titanium alloy plate, Cr8-Ni8 austenitic stainless steel plate and pure copper welding wire:

[0042] First process the TA15 titanium alloy plate to be connected to a groove with a groove angle of 30° and a blunt edge of 1mm; then polish the groove and its surroundings with sandpaper until the metallic luster is exposed;

[0043] Use sandpaper to polish the surface of the Cr8-Ni8 austenitic stainless steel plate to be welded, so that the surface roughness reaches Ra1.6-3.2;

[0044] Use pure copper welding wire with a diameter of 2mm as the filler metal, and sand the surface of the welding wire until it reveals a metallic lu...

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Abstract

The invention discloses a dissimilar material connection process for TA15 titanium alloy and austenitic stainless steel, which comprises the following steps of: before welding, polishing surfaces to be connected of the TA15 titanium alloy and the austenitic stainless steel which are flattened by abrasive paper so as to ensure the roughnesses of the surfaces to be welded to reach Ra1.6 to 3.2; cleanly polishing the surfaces of pure copper welding wires by the abrasive paper; horizontally abutting and placing the TA15 titanium alloy and an austenitic stainless steel sheet which have equivalent size specifications and forming a single-sided V-shaped groove with an angle of 30 degrees to 45 degrees at one side of the TA15 titanium alloy, wherein an assembling gap is 0.05mm to 0.15mm and the specification of a truncated edge is 1 to 2mm; adding the pure copper welding wires between the TA15 titanium alloy and an austenitic stainless steel connecting piece, carrying out weld preheating on the TA15 titanium alloy and an austenitic stainless steel weldment by adopting oxy-acetylene flame, controlling the heat distribution to carry out wire filling tungsten electrode argon-arc welding and protecting a welding region by adopting pure argon, wherein the welding process has parameters of a welding voltage of 12 to 15V, a welding current of 80 to 100A, a welding speed of 100 to 130mm/min and an argon flow of 10 to 15L/min; and after welding, immediately covering the weldment with asbestos cloth to carry out heat preservation and moving the asbestos cloth until the temperature is cooled to below 50 DEG C.

Description

technical field [0001] The invention belongs to the connection technology of dissimilar materials, and relates to the technical fields of materials, machinery, aerospace, chemical industry, etc., in particular to a wire-filled tungsten argon arc welding process of TA15 titanium alloy and austenitic stainless steel. Background technique [0002] At present, TA15 titanium alloy has been widely used in aerospace, chemical industry, power station and other fields due to its advantages of high specific strength, corrosion resistance and good weldability. TA15 titanium alloy can play an important role in reducing structural quality, improving structural efficiency, improving structural reliability, increasing the life of the body, and meeting the requirements of high temperature, high load and corrosive environments. [0003] It is difficult for a single TA15 titanium alloy to meet the different requirements of different parts of the product for performance. In some cases, dissim...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/23B23K35/30B23K103/24
Inventor 王娟刘强李亚江
Owner SHANDONG UNIV
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