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Cu-V-Ag flux-cored wire for titanium-pipeline-steel welding and preparing method thereof

A flux-cored welding wire, cu-v-ag technology, applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem of refractory welding connection of titanium-pipeline steel composite plate, large difference in chemical properties, Problems such as hindering the application of oil and gas pipelines can achieve the effect of reducing welding stress, improving interfacial structure and morphology, and facilitating large-scale mass production

Inactive Publication Date: 2015-07-01
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large differences in the physical and chemical properties of titanium and steel, it is easy to form low-melting eutectics and brittle compounds between Ti and Fe metals, making it difficult to weld titanium-pipeline steel composite plates, which seriously hinders its application in oil and gas pipelines. Applications
At present, there are only a few reports on the welding process of the titanium-pipeline steel clad plate, and the existing titanium-pipeline steel clad plate butt joints are all made of titanium and steel with a cover plate that are incompatible with each other. method, this welding method is complicated in process and difficult to realize engineering application, and there is no report on its fusion welding connection welding materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the above-mentioned Cu-V-Ag flux-cored welding wire for welding titanium-pipeline steel, the specific steps are as follows:

[0026] Step 1: Weighing 80-90% V powder and 10-20% Ag powder respectively by mass percentage, the sum of the mass percentages of the above components is 100%;

[0027] Step 2: Put the V powder and Ag powder weighed in step 1 into a powder mixer, and dry mix to obtain a uniformly mixed drug core powder; dry it in a vacuum heating furnace to remove crystals in the drug core powder water, the drying temperature is 200°C, and the drying time is 2.5h;

[0028] Step 3: Wrap the flux core powder dried in step 2 in a copper tape through a flux cored wire machine, control the filling amount of the flux core powder to 13-15%, and then draw it to a diameter of 1.2mm to obtain Cu- V-Ag flux cored wire.

Embodiment 1

[0030] Step 1: Weigh 80% V powder and 20% Ag powder respectively by mass percentage, and the sum of the mass percentages of the above components is 100%;

[0031] Step 2: Put the V powder and Ag powder weighed in step 1 into a powder mixer, and dry mix to obtain a uniformly mixed drug core powder; dry it in a vacuum heating furnace to remove crystals in the drug core powder water, the drying temperature is 200°C, and the drying time is 2.5h;

[0032] Step 3: Wrap the flux core powder dried in step 2 in a copper tape through a flux cored wire machine, control the filling amount of flux core powder to 13%, and then draw it to a diameter of 1.2mm to obtain Cu-V- Ag flux cored wire.

[0033] Use the Cu-V-Ag flux-cored wire (transition layer) prepared in Example 1, cooperate with pure titanium wire (titanium layer), and ER50-6 pipeline steel wire (steel layer) to weld titanium-pipeline steel (TA1-Q345) composite plate. The welding process is: Titanium-pipeline steel (TA1-Q345) c...

Embodiment 2

[0036] Step 1: Weigh 90% V powder and 10% Ag powder respectively by mass percentage, and the sum of the mass percentages of the above components is 100%;

[0037] Step 2: Put the V powder and Ag powder weighed in step 1 into a powder mixer, and dry mix to obtain a uniformly mixed drug core powder; dry it in a vacuum heating furnace to remove crystals in the drug core powder water, the drying temperature is 200°C, and the drying time is 2.5h;

[0038] Step 3: Wrap the flux core powder dried in step 2 in a copper tape through a flux cored wire making machine, control the filling amount of the flux core powder to 14%, and then draw it to a diameter of 1.2mm to obtain Cu-V- Ag flux cored wire.

[0039] Use the Cu-V-Ag flux-cored wire (transition layer) prepared in Example 2, cooperate with pure titanium wire (titanium layer), and ER50-6 pipeline steel wire (steel layer) to weld titanium-pipeline steel (TA1-Q345) composite plate. The welding process is: Titanium-pipeline steel (...

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Abstract

The invention discloses a Cu-V-Ag flux-cored wire for titanium-pipeline-steel welding. The Cu-V-Ag flux-cored wire comprises a core wire and a coating. The core wire comprises, by mass, 80% to 90% of V powder and 10% to 20% of Ag powder; the sum of the mass percent of the components is 100%, and the coating is made of a copper band. The invention further discloses a preparing method of the Cu-V-Ag flux-cored wire. The preparing method includes the steps of evenly mixing the V powder and the Ag powder, then drying the mixture, wrapping the mixture with the copper band, drawing the mixture to enable the diameter to be 1.2 mm, and obtaining the Cu-V-Ag flux-cored wire. According to the Cu-V-Ag flux-cored wire for titanium-pipeline-steel welding, V elements and Ti elements can form continuous solid solutions; Cu is non-carbide-forming-elements, the Cu and various elements in steel can form solid solutions, and the certain effect on preventing intermetallic compound brittle phases of a transition layer is achieved. Ag elements and Ti elements have the certain solubility, and brittle phases such as intermetallic compounds are avoided; silver is soft in texture, the welding stress of the transition layer can be reduced, and cracks can be reduced.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a Cu-V-Ag flux-cored wire for titanium-pipeline steel welding, and also relates to a preparation method of the flux-cored wire. Background technique [0002] Titanium-pipeline steel composite plate is a new type of explosive bimetallic composite plate, which combines the strong corrosion resistance of titanium and the high strength and toughness of pipeline steel. Realizing its application on oil and gas transportation pipelines can not only solve the difficulty that a single pipeline steel pipeline is easily corroded, but also solve the high cost problem of using a single corrosion-resistant material to manufacture oil and gas transportation pipelines. However, due to the large difference in physical and chemical properties of titanium and steel, it is easy to form low-melting eutectics and brittle compounds between Ti and Fe metals, making it difficul...

Claims

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Application Information

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IPC IPC(8): B23K35/32B23K35/40
CPCB23K35/325B23K35/406
Inventor 张敏樊庆仰谢威威褚巧玲罗海龙韩挺
Owner XIAN UNIV OF TECH