Double wire underwater wet welding device and method

A technology of wet welding and welding equipment, applied in the field of twin-wire underwater wet welding equipment, which can solve the problems of reduced arc stability, thinner arc column, narrower weld width, etc.

Inactive Publication Date: 2016-06-29
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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Effect test

Embodiment 1

[0035] Such as Figure 4 As shown, in this embodiment, the angle α formed by the slave contact tip 75 and the welding workpiece 8 is 30-120°, for example, 50, 75, and 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, and 110 degrees, and the distance H between the two contact tips is 15-30 mm, such as 15, 20, 25, and 30 mm, to ensure that the two welding wires form an elliptical molten pool.

Embodiment 2

[0037] Such as Figure 5 As shown, in this embodiment, the angle β formed by the main nozzle 65 and the welding workpiece 8 is 30-60 degrees, for example, 30, 40, 50, 60 degrees ( Figure 4 60°), the angle α formed by the slave contact tip 75 and the welding workpiece 8 is 90°, the main welding torch 6 uses solid-core welding wire, and the slave welding torch 7 uses flux-cored welding wire. At this time, the slave welding torch 7 vertically penetrates into the water , and use a larger welding current, such as 200A, 250A, 300A, which is conducive to the formation of a larger air bag, while the main welding torch 6 and the welding workpiece 8 form a certain angle, which mainly plays the role of filling metal and controlling the molten pool. In this way, the arc formed by the main welding torch 6 is inclined, while the arc formed by the secondary welding torch 7 is perpendicular to the welding workpiece 8. In this way, the two arcs acting on the same welding point not only increa...

Embodiment 3

[0039] Such as Image 6 As shown, since the main welding gun 6 and the slave welding gun 7 have the same structure, the difference from the second embodiment is that the main welding wire 3 and the slave welding wire 4 are interchanged in this embodiment, the main welding gun 6 adopts flux cored wire, and the slave welding gun 7 adopts solid welding wire. Core welding wire, wherein the main welding torch 6 uses a relatively large 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 removing water, and is formed from the welding torch 7 The arc is vertical and mainly plays the role of filling metal and controlling the molten pool. Other steps, connection methods and implementation principles are the same as those in Embodiment 2.

[0040] The operating steps of the twin wire underwater wet welding method among the present invention are as follows:

[0041] Ste...

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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 that has good arc ignition performance, improves stable arc combustion, and obtains high-quality underwater wet welding joints. Background technique [0002] As the name implies, twin-wire welding uses two welding wires to weld at the same time, heat each other, make full use of the energy of the arc, improve the deposition efficiency and welding speed, and the size of the molten pool is large, the high temperature stays for a long time, the cooling speed is slow, and the double arc is strong. The stirring effect makes the gas in the molten pool have sufficient time to precipitate, and the tendency of pores 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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