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Method and equipment for electromagnetic composite double-face submerged arc welding of diphase stainless steel thick plate

A duplex stainless steel and submerged arc welding technology, which is applied in arc welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of cumbersome process and submerged arc welding quality of duplex stainless steel, so as to avoid material waste and reduce Effects of small chemical heterogeneity and sensitivity reduction

Inactive Publication Date: 2009-06-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency, high-quality, low-cost welding method and supporting equipment for duplex stainless steel, so as to break through the limitations of the traditional welding method of duplex stainless steel, and to meet the strict requirements of welding process conditions, and to meet the requirements of the welding seam structure. Due to the requirement of dual-phase balance, the technical problems to be solved are the cumbersome process of beveling thick plate welding, and the quality of submerged arc welding of duplex stainless steel, and the development of advanced thick plate duplex stainless steel welding technology

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  • Method and equipment for electromagnetic composite double-face submerged arc welding of diphase stainless steel thick plate
  • Method and equipment for electromagnetic composite double-face submerged arc welding of diphase stainless steel thick plate

Examples

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Effect test

example 1

[0044] Example 1: Electromagnetic composite submerged arc welding of 2205 duplex stainless steel with a plate thickness of 6mm, using E2209 welding wire, for the construction of chemical ships; Clean up the oil and moisture on the end face of the joint and dry it. Ceramic liners are used on the back of the weld seam; bottom welding and cover welding are performed by MIG welding. The welding current is 120-160A, the welding speed is 35-50cm / min, and the shielding gas It is 99.9% argon, the shielding gas flow rate is 18L / min, the shielding gas is passed for 25s before the welding arc is started, and the shielding gas is kept for 30s after the arc is extinguished; the electromagnetic composite submerged arc welding method without opening the groove is adopted , The welding process parameters are as follows: excitation current is 5-20A, magnetic field frequency is 3-15Hz, welding current is 350-600A, welding wire diameter is 2.4mm, welding voltage is 30-45V, welding speed is 15-60m...

example 2

[0045] Example 2: Electromagnetic composite submerged arc welding of 2205 duplex stainless steel with a plate thickness of 12mm, using ER2209 welding wire, the joint adopts I-shaped groove, the assembly gap is 2mm, the end surface of the joint is machined to be smooth and smooth, and the oil and water on the end surface of the joint are cleaned before welding , and dry, the back of the weld is connected with argon + 10% nitrogen as a shielding gas, and the flow rate of the shielding gas is 16L / min; the MAG welding method is used for bottom welding and cover welding, and the welding current is 140-180A. The speed is 30-45cm / min, the shielding gas is argon + 10% nitrogen mixed gas, the shielding gas flow rate is 22L / min, the shielding gas is used for 25s before the welding arc starts, and the shielding gas is kept for 30s after the arc is extinguished; The electromagnetic composite double-sided submerged arc welding method without groove is adopted, and the welding process parame...

example 3

[0046] Example 3: The magnetically permeable magnetic core 16 is a Q235 steel pipe with an outer diameter of ф40mm, and three threaded holes 2 are drilled at a distance of 5mm from the upper end of the magnetically permeable core, with a diameter of ф5mm. Here, it cooperates with the top tightening screw to fix the water-cooled excitation coil 4; The upper retaining ring 13 and the lower retaining ring 9 are made of red copper, with an outer diameter of ф80mm and a thickness of 2mm. On the upper retaining ring 13, a ф3mm wire inlet 14 and a ф3mm wire outlet 15 are drilled. The upper retaining ring 13 is at ф42mm Drill a ф7mm water outlet port 3 on the circumference; the outer diameter of the cooling copper pipe is ф6mm; lay a 1mm thick insulating layer 11 on the cooling copper pipe; wrap a 1mm protective layer 10 around the coil.

[0047] In actual welding, according to different welding processes, base metal materials, welding materials and joint forms, etc., the electromagnet...

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Abstract

The invention discloses a method for welding a dual-phase stainless steel and a device thereof. The method comprises: dual-side surfacing of heavy current submerged arc is controlled by an electromagnetic-composite field of the dual phase stainless steel of heavy plates without a grooveb; excitation current is provided by an excitation power supply to generate an additional longitudinal electromagnetic field; and a submerged arc welding process of the dual-phase stainless steel of the heavy plates without the groove is comprehensively controlled and realized by the electromagnetic field. The welding device is provided with the excitation power supply, a welding power supply, an excitation welding device, a device of an auxiliary electric field and a water cooling system. The excitation device consists of excitation coils, is fixed on a welding torch, and generates the additional longitudinal electromagnetic field which is coaxial with the welding torch, and the water cooling system is arranged in a bracket of the excitation coils. The device can realize the submerged arc welding of the dual-phase stainless steel of the heavy plates without the groove, with high efficiency, high quality and low cost through the electromagnetic-complex submerged arc welding; meanwhile, the device can be used for welding the dual-phase stainless steel of the heavy plates in industries, such as shipbuilding, chemical industry and so on.

Description

technical field [0001] The invention relates to the field of welding, in particular to an electromagnetic composite double-sided submerged arc welding method and equipment for duplex stainless steel thick plates. Background technique [0002] Duplex stainless steel is an alloy material based on ferrite and austenite. It has high strength, good toughness and strong corrosion resistance. It has been widely used in offshore oil and petrochemical industries at home and abroad. In the microstructure of the base metal, the proportions of ferrite and austenite are in a relatively balanced state, each accounting for 50%, so it is called duplex stainless steel. For the weld, its microstructure is also required to have the same duplex as the base metal. Phase structure, so the correct welding process and equipment must be selected to meet the needs of duplex stainless steel welding. [0003] The duplex stainless steel welding technologies widely used at home and abroad are: manual ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/095
Inventor 罗键
Owner CHONGQING UNIV
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