Double wire automatic submerged arc welding process

A submerged arc welding and automatic technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as aggregation and damage to weld performance, and achieve improved weld microstructure and comprehensive mechanical properties, weld microstructure and comprehensive mechanical properties improvement effect

Inactive Publication Date: 2009-10-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The faster the welding speed, the closer the angle between the direction of grain growth and the moving direction of the molten pool is to 90°. As a result, the grains grow toward the center of the weld in the form of columnar grains and meet the grains on the other side at On the center line, not only is there no equiaxed crystal in the center of the weld, but also a large amount of low-melting eutectic and impurities are gathered, which will cause serious damage to the weld performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Use the clean API 2HGr.42 steel (or Q345E) plate as the weldment, the thickness of the plate is 20mm, and the size is 500×200×20; the weld joint form of the weldment is set to butt joint type, and the welding groove is set It is I-shaped, fixed on the clamping mechanism, with a stainless steel backing plate on the back of the weld groove, and the size of the backing plate is 600×300×20;

[0018] 2. Determine the following process parameters according to the material and thickness of the weldment: welding current (DC, front 300A / back 200A), welding voltage (front 25V / back 20V), welding speed 80mm / min, welding torch or wire angle (front 90° / back 60°), the wire feeding speed is 500mm / min, the welding wire diameter is 2.0mm, the flux delivery rate is 600g / min, the distance between the two welding torches in the welding direction is 5mm, the preheating magnetic field excitation current is 10A, the preheating Magnetic field excitation frequency 1Hz, electromagnetic stirr...

Embodiment 2

[0024] 1. Use the clean ASTMA36 steel (or Q235B) plate as the weldment, the thickness of the plate is 30mm, and the size is 500×300×30; the weld joint form of the weldment is set to butt joint type, and the welding groove is set to Y shape , fixed on the clamping mechanism, and a copper backing plate is placed on the back of the weld groove, and the size of the backing plate is 600×400×20;

[0025] 2. Determine the following process parameters according to the material and thickness of the weldment: welding current is AC (front 400A / back 300A), welding voltage (front 30V / back 26V), welding speed is 200mm / min, welding torch or wire angle (front 90° / back 70°), the wire feeding speed is 800mm / min, the welding wire diameter is 3.2mm, the flux delivery rate is 900g / min, the distance between the two welding torches in the welding direction is 20mm, the preheating magnetic field excitation current is 30A, the preheating magnetic field Excitation frequency 100Hz, electromagnetic sti...

Embodiment 3

[0031] 1. The clean API 5LGr.B steel (or 20#) plate is used as the weldment, the thickness of the plate is 40mm, and the size is 800×400×40; the weld joint form of the weldment is butt joint, and the welding groove is set to V font, fixed on the clamping mechanism;

[0032] 2. Determine the following process parameters according to the material and thickness of the weldment: welding current is AC (front 600A / back 500A), welding voltage (front 35V / back 30V), welding speed is 400mm / min, welding torch or wire angle (front 90° / back 70°), the wire feeding speed is 1200mm / min, the welding wire diameter is 4.0mm, the flux delivery rate is 1200g / min, the distance between the two welding torches in the welding direction is 50mm, the preheating magnetic field excitation current is 60A, the preheating magnetic field Excitation frequency 600Hz, electromagnetic stirring magnetic field excitation current 120A, electromagnetic stirring magnetic field excitation frequency 6000Hz, heat treat...

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Abstract

The invention provides a double wire automatic submerged arc welding process. The process comprises the following steps of: cleaning and fixing weldments; setting a weld groove; setting parameters of the welding process; and adjusting the position of a welding gun to weld a welding connector. The improvements of the process include: the set parameters of the welding process comprise a pre-heating magnetic field exciting current, a pre-heating magnetic field exciting frequency, an electromagnetic stirring magnetic field exciting current, an electromagnetic stirring magnetic field exciting frequency, a thermal treatment magnetic field exciting current and a thermal treatment magnetic field exciting frequency; after the position of the welding gun is changed on the welding connector, a pre-heating exciting coil is started first to generate pre-heating magnetic fields to pre-heat the welding wire and the groove; when a double wire submerged arc welding gun makes arc strike weld on a run-on plate in front of the weld seam, the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil are started to generate electromagnetic stirring magnetic fields and electromagnetic thermal treatment external magnetic fields; and when the double wire submerged arc welding gun reaches a run-off plate at the tail end of the weld seam, the welding gun extinguishes arc and is lifted, and at the same time, the power supply of the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil is cut off, so that the weld is completed. The comprehensive mechanical properties of the welding connector are improved.

Description

technical field [0001] The invention relates to welding technology, in particular to a method of preheating the welding wire and the groove by using a preheating magnetic field before welding, and simultaneously using the dual effects of electromagnetic stirring magnetic field and electromagnetic heat treatment and applying an electromagnetic field to change the crystallization state of the weld pool metal, thereby It is a double-wire automatic submerged arc welding process that improves the quality of the weld seam and increases the strength, toughness and service life of the welded structure. Background technique [0002] The double-wire automatic submerged arc welding process has high efficiency. Compared with manual arc welding or single-wire automatic welding, the production efficiency can be increased by 2-4 times, and it has great production and application prospects. At present, the twin-wire automatic submerged arc welding equipment and its welding process developed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/095B23K9/235B23K9/18
Inventor 丁文斌曹军
Owner CHINA NAT OFFSHORE OIL CORP
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