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Method for cold arc welding of titanium and titanium alloy

A titanium alloy and arc welding technology, which is applied in welding equipment, welding accessories, arc welding equipment, etc., can solve problems such as cold cracks and large residual stress in welds, achieve stable welding process, reduce residual stress, reduce The effect of welding deformation

Active Publication Date: 2010-04-21
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the present invention proposes a method for cold arc welding of titanium and titanium alloys. The method determines the suitable welding mode, type of welding shielding gas, and welding method for cold arc welding of titanium and titanium alloys through a large number of welding tests. Spatter control, welding groove design, welding process parameters and other parameters solve the deformation of titanium and titanium alloys during the welding process, solve the problems of large residual stress in the weld and easy cold cracks, and improve product quality

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  • Method for cold arc welding of titanium and titanium alloy
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  • Method for cold arc welding of titanium and titanium alloy

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Effect test

Embodiment 1

[0046] Using the titanium and titanium alloy cold arc welding method of the present invention, the welding of titanium and titanium alloy shroud simulation parts has been carried out, and the welding seam structure forms include 4mm+4mm plate thickness butt weld seam, 4mm+16mm plate thickness fillet weld seam , 16mm+16mm plate thickness fillet welds, V-shaped grooves are used for butt welding, groove surface angle α=30°groove gap b=2mm. The whole welding process is stable, the welding efficiency is high, and the weld seam quality meets the requirements of the titanium alloy shroud manufacturing standard. The welding parameters used in the welding process are as follows:

[0047] Welding Wire Feed Speed ​​Welding Speed ​​Arc Length Correction Pulse Wire Gauge Shielding Gas

[0048] Location

[0049] Mode m / min cm / min % Correction division mm type

[0050] 1.3 65%He+35

[0051] Butt welding CMT+P 6.0~6.8 30~35 10~15...

Embodiment 2

[0061] Using the titanium and titanium alloy cold arc welding method of the present invention, carried out 1mm thick, 300mm long, 150mm wide test plate flat welding position butt welding test, adopt I type groove, groove gap b=0. The welding process is stable, the back of the weld is well formed, and the internal quality of the weld meets the requirements of JB / T4730.2-2005 level II. The welding parameters used in the welding process are as follows:

[0062] Welding Wire Feed Speed ​​Welding Speed ​​Arc Length Correction Dynamic Wire Gauge Shielding Gas

[0063] Mode m / min cm / min % Correction division mm type

[0064] 70%He+30

[0065] CMT 4.0 50~55 15 1.2 Φ1.2

[0066] %Ar

Embodiment 3

[0068] Using the titanium and titanium alloy cold arc welding method of the present invention, carried out 2mm thick, 300mm long, 150mm wide test plate flat welding position butt welding test, adopt V-shaped groove, groove surface angle α=45 °, groove Gap b=1mm. The welding process is stable, the back of the weld is well formed, and the internal quality of the weld meets the requirements of JB / T4730.2-2005 level II. The welding parameters used in the welding process are as follows:

[0069] Welding Wire Feed Speed ​​Welding Speed ​​Arc Length Correction Dynamic Wire Gauge Shielding Gas

[0070] Mode m / min cm / min % Correction division mm type

[0071] 70%He+30

[0072] CMT 7.0 40~45 15 1.5 Φ1.2

[0073] %Ar

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Abstract

The invention provides a method for cold arc welding of titanium and titanium alloy, which comprises the five steps of welding groove setting, a welding mode, selection of protective gas, splashing control in the welding process and establishment of welding process parameters, wherein the welding groove setting is divided into an I type welding groove, a V type welding groove and a U type welding groove; the welding mode comprises cold arc welding CMT butt welding, cold arc impulse welding CMT plus P butt welding or cold arc impulse welding CMT plus P fillet welding; the protective gas is He plus Ar mixed gas; besides the protective gas, the splashing in the welding process is mainly affected by arc length correction, impulse correction or dynamic correction, the arc length correction is controlled to be between 0 and 20 percent, and the impulse correction or the dynamic correction is controlled to be between 0 and 2.0; and the establishment of the welding process parameters differs because of the fillet welding and the butt welding. The method has the advantages of having a stable welding process, obtaining indefectible and performance-qualified welding lines, effectively reducing welding deformation of complex structure parts of titanium and titanium alloy, lowering the residual stress of the welding lines and improving product quality and production efficiency.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for cold arc welding of titanium and titanium alloys. Background technique [0002] At present, the commonly used welding methods for titanium and titanium alloys are mainly tungsten argon arc welding (TIG), molten inert gas arc welding (MIG), plasma welding (PAW), etc. However, the heat input of the above welding methods is relatively large. Large-scale titanium and titanium alloy structural parts with intersecting seams, welding deformation, and cracks caused by large welding internal stress are difficult to solve. At the same time, the large amount of heat input will lead to a decrease in the performance of the weld and the heat-affected zone. Therefore, there is an urgent need for a welding process method with lower heat input to further improve product and weld quality. [0003] The cold arc welding method is a new type of welding technology. Through t...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K33/00B23K9/32B23K9/12
Inventor 何刚柳军张建欣崔永杰
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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