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Double-wire underwater wet welding device and method

A technology of wet welding and welding equipment, which is applied in the field of double-wire underwater wet welding equipment, and can solve the problems of increasing the difficulty of ionization, high hydrogen content in the weld, and increased weld height.

Inactive Publication Date: 2015-03-11
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of water, the hydrogen content of the weld will be high; the cooling speed will cause the weld to produce a hardened structure; the high pressure of the arc environment will cause the arc column to become thinner, the weld width will be narrowed, and the weld height will be increased. , at the same time the density of the conductive medium increases, increasing the difficulty of ionization, the arc voltage increases accordingly, and the arc stability decreases

Method used

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  • Double-wire underwater wet welding device and method
  • Double-wire underwater wet welding device and method

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Embodiment 1

[0036] Such as Figure 4 As shown, in this embodiment, the angle α between the contact tip 75 and the welding workpiece 8 is 30-120°, for example, 50, 75, 100 degrees, and the angle β formed by the main contact tip 65 and the welding workpiece 8 is 60-120°, such as 70, 90, 110 degrees, and the distance H between the two conductive nozzles is 15-30mm, such as 15, 20, 25, 30mm, to ensure that the two welding wires form an elliptical molten pool.

Embodiment 2

[0038] Such as Figure 5 As shown, in this embodiment, the angle β between the main contact tip 65 and the welding workpiece 8 is 30-60°, for example, 30, 40, 50, 60 degrees ( Figure 4 The middle is 60 degrees), the angle α between the contact tip 75 and the welding workpiece 8 is 90 ゜, the main welding gun 6 adopts solid welding wire, and the secondary welding gun 7 adopts flux-cored welding wire. At this time, the welding gun 7 penetrates vertically into the water , And the use of larger welding currents, such as 200A, 250A, 300A, is conducive to the formation of larger airbags, and the main welding gun 6 and the welding workpiece 8 form a certain angle, mainly to fill the metal and control the molten pool. In this way, the arc formed by the main welding torch 6 is inclined, and the arc formed by the welding torch 7 is perpendicular to the welding workpiece 8. In this way, the two arcs acting on the same welding spot not only increase the deposition rate, but also promote the ...

Embodiment 3

[0040] Such as Image 6 As shown, since the main welding torch 6 and the slave welding torch 7 have the same structure, the difference from the second embodiment is that in this embodiment, the main welding wire 3 and the slave welding wire 4 are interchanged. The main welding torch 6 uses flux-cored welding wire, and the slave welding torch 7 uses real Core welding wire, the main welding torch 6 adopts larger welding current, such as 200A, 250A, 300A, the arc formed by the main welding torch 6 is inclined, and the formed air bag is also inclined, which mainly plays the role of draining water. It is formed from the welding torch 7. The arc is vertical and mainly plays the role of filling metal and controlling the molten pool. The other steps, connection modes and implementation principles are the same as in the second embodiment.

[0041] The operating steps of the double-wire underwater wet welding method of the present invention are as follows:

[0042] Step one, preparation wo...

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Abstract

The invention relates to a double-wire underwater wet welding device and a double-wire underwater wet welding method. The welding device comprises a master welding gun power supply, a slave welding gun power supply, a master wire conveyor, a slave wire conveyor, a master welding gun and a slave welding gun, wherein the master welding gun and the slave welding gun are respectively connected to the master welding gun power supply and a slave welding gun power supply, a master welding wire and a slave welding wire are respectively conveyed to the end parts of the master and slave welding guns through the master and slave wire conveyors, the master welding gun and the slave welding gun are respectively arranged to form a certain angle with a workpiece to be welded, and a certain distance is kept between the front end of the master welding gun and the front end of the slave welding gun. According to the double-wire underwater wet welding device and method, the two welding wires in the master and slave welding guns are heated mutually, and the energy of electric arc is fully used, so that the deposition rate is greatly improved, and the problem that the underwater wet welding molten bath and the base metal cannot be fully fused is overcome.

Description

Technical field [0001] The invention relates to the technical field of underwater welding, in particular to a double-wire underwater wet welding device and method with good arc starting performance, improved arc stable combustion, and high-quality underwater wet welding joints. Background technique [0002] Double-wire welding, as the name implies, uses two welding wires to weld at the same time, heating each other, making full use of the energy of the arc, improving the deposition efficiency and welding speed, and the size of the molten pool is large, the high temperature residence time is long, the cooling speed is slow, and the double arc is strong The stirring effect allows sufficient time for the gas in the molten pool to separate out, and the pore tendency is low. It has been successfully applied in the fields of automobiles, shipbuilding, pressure vessels, and power generation equipment. [0003] With the development of the ocean, underwater welding has become an important t...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/28
CPCB23K9/0061
Inventor 孙清洁王建峰刘一搏吴来军王世路赵换尧冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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