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Ultrasonic frequency pulse auxiliary electric arc welding method for dissimilar steel in underwater wet environment

A wet environment, underwater environment technology, applied in dissimilar steel ultrasonic frequency pulse assisted FCAW or SMAW (manual arc welding, arc welding, manual arc welding field, can solve the problem of low diffusible hydrogen content, to reduce diffusible hydrogen content, Important practical application value and the effect of ensuring safe development

Pending Publication Date: 2022-01-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing welding technology cannot satisfy the welding of dissimilar steels in underwater wet environment, and to invent a method for ultrasonic pulse-assisted arc welding of dissimilar steels in underwater wet environment, so as to obtain welding with low diffusible hydrogen content joints, prevent hydrogen-induced cracks, and improve and precisely control weld formation by adjusting process parameters

Method used

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  • Ultrasonic frequency pulse auxiliary electric arc welding method for dissimilar steel in underwater wet environment
  • Ultrasonic frequency pulse auxiliary electric arc welding method for dissimilar steel in underwater wet environment

Examples

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Embodiment 1

[0020] Such as Figure 1-2 shown.

[0021] A method for ultrasonic pulse-assisted arc welding of dissimilar steels in an underwater wet environment. The base metals used are low-alloy steel and austenitic stainless steel with a thickness of 8mm. The welding method is FCAW or SMAW welding technology, and the welding current For ultrasonic frequency pulse current, described welding comprises the following steps:

[0022] Step (1) Prepare before welding, clean and derust the low-alloy steel / austenitic stainless steel dissimilar steel plate, and wire-cut a 60° V-shaped groove at the place to be welded, leaving a 2mm blunt edge, and the welding material is water Under the special nickel-based self-shielding flux-cored wire.

[0023] Step (2) Set the welding parameters, the welding current is 200A, the voltage is 30V, the output current of the ultrasonic frequency power supply is 45A, the power is 4kW, and the pulse frequency is 30kHz.

[0024] During specific implementation, the...

Embodiment 2

[0026] A method for assisting SMAW arc welding of dissimilar steels in an underwater wet environment by ultrasonic frequency pulses, the base metal used is low alloy steel and austenitic stainless steel, the thickness is 6mm, the welding method is SMAW welding technology, and the welding current is Ultrasonic frequency pulse current, described welding comprises the following steps:

[0027] Step (1) Prepare before welding, clean and derust the low-alloy steel / austenitic stainless steel dissimilar steel plate, and wire-cut a 45° V-shaped groove at the place to be welded, leaving a 1mm blunt edge, and the welding material is water The next special austenitic stainless steel electrode.

[0028] Step (2) Set welding parameters, welding current 160A, voltage 25V, dry elongation 10mm, ultrasonic frequency excitation source current 35A, power 6kW, pulse frequency 35kHz.

[0029] During specific implementation, the welding power source used can be directly customized from the market....

Embodiment 3

[0035] The difference between this embodiment and Embodiments 1 and 2 is that the V-shaped groove of 45° or 50° is processed by wire cutting at the place to be welded, leaving a blunt edge of 0.5mm or 1mm, and the welding material is a special nickel-based self-protecting flux core for underwater use. Welding wire / rod or stainless steel self shielded flux cored wire or rod.

[0036] Welding parameters, welding current 100A or 300A, arc voltage 24V or 40V, ultrasonic power supply output current 35A or 105A, power 4 kW or 7.5kW, pulse frequency 20kHz or 60 kHz.

[0037] All the other are identical with embodiment one, two, and weld seam cross section metallographic and figure 1 (b) Similar.

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Abstract

The invention discloses an ultrasonic frequency pulse auxiliary electric arc welding method for dissimilar steel in an underwater wet environment. The method comprises the following steps that a V-shaped groove of 45-60 degrees is formed in a steel plate, a truncated edge of 2 mm is reserved, and rust near the groove is polished thoroughly; an ultrasonic frequency pulse auxiliary arc welding process is adopted, a self-shielded flux-cored wire is used for welding, and shielding gas is not needed; and the process can effectively reduce the diffusible hydrogen content of a welding joint, prevent hydrogen-induced cracks, improve and accurately control welding seam forming (the weld reinforcement and the back collapse amount are smaller than or equal to 2 mm) by controlling welding parameters, solve the problem that the quality of a dissimilar steel underwater welding joint is low, guarantee safe development of the ocean and nuclear power fields, and have very important theoretical significance and practical application value.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a welding method for dissimilar steel structures in an underwater environment, in particular to an ultrasonic pulse-assisted FCAW (flux-cored welding wire melting electrode gas shielded welding) or SMAW of dissimilar steels in an underwater wet environment (Manual arc welding is an arc welding method that uses manual manipulation of electrodes for welding, referred to as manual arc welding. The electrode and the weldment are used as two electrodes, and the metal to be welded is called the weldment or base material) arc welding method. Background technique [0002] At present, many dissimilar steel structures serve in underwater environments, such as submarine oil and gas pipelines, offshore platforms, etc. In order to ensure the safe and stable operation of these structures, it is necessary to vigorously develop welding methods for dissimilar steel structures used in underwater env...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/09B23K9/173B23K9/235
CPCB23K9/0061B23K9/09B23K9/173B23K9/235
Inventor 马强李洪亮刘世雄朱强雷玉成
Owner JIANGSU UNIV
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