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Weld seam coolant for straight seam submerged arc welding of steel pipe and its application method

A technology of straight seam submerged arc and coolant, which is applied to arc welding equipment, other household appliances, chemical instruments and methods, etc., to achieve the effects of avoiding deformation and cracking, increasing electrical conductivity, and uniform cooling

Active Publication Date: 2017-08-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a lack of a steel pipe straight seam submerged arc welding seam coolant for enhancing the strength and toughness of the weld seam and its application method

Method used

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  • Weld seam coolant for straight seam submerged arc welding of steel pipe and its application method
  • Weld seam coolant for straight seam submerged arc welding of steel pipe and its application method
  • Weld seam coolant for straight seam submerged arc welding of steel pipe and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as Figure 1 to Figure 3 as shown, image 3 It is the metallographic appearance of the X80 steel pipe weld seam in Example 1. The finer the crystal grains in the metallographic appearance, the higher the strength of the weld seam structure and the better the toughness.

[0026] A kind of steel pipe straight seam submerged arc welding weld seam coolant of the present invention, concrete composition mass percentage is as follows:

[0027]

[0028] Prepare each component according to the above ratio, add it into a reaction kettle with a stirring device and a heating function, adjust the temperature at 30° C. and stir until completely dissolved to obtain the cooling liquid of the present invention.

[0029] The corrosion inhibitors are polyphosphate and chromate. The defoamer is a low-foaming nonionic surfactant.

[0030] The method for using the weld seam coolant of straight seam submerged arc welding of steel pipes according to the present invention comprises t...

Embodiment 2

[0036] The difference between embodiment 2 and embodiment 1 is: a steel pipe straight seam submerged arc welding seam coolant of the present invention, the specific composition mass percentage is as follows:

[0037]

[0038] Prepare each component according to the above ratio, add it into a reaction kettle with a stirring device and a heating function, adjust the temperature at 35° C. and stir until completely dissolved to obtain the cooling liquid of the present invention.

[0039] The corrosion inhibitor is chromate. The defoamer is a polyether type nonionic surfactant.

[0040] The method for using the weld seam coolant of straight seam submerged arc welding of steel pipes according to the present invention comprises the following steps:

[0041] (1) Place the steel pipe 1 made of X70 on the rotating roller 8 of the welding trolley 7. During welding, the welding trolley can move at a constant speed from left to right through the wheel 9; before welding, adjust the posi...

Embodiment 3

[0044] The difference between embodiment 3 and embodiment 1 is: a kind of steel pipe straight seam submerged arc welding seam coolant of the present invention, the specific composition mass percentage is as follows:

[0045]

[0046] Prepare each component according to the above ratio, add it into a reaction kettle with a stirring device and a heating function, adjust the temperature at 40° C. and stir until completely dissolved to obtain the cooling liquid of the present invention.

[0047] The anti-corrosion agent is polyphosphate. The defoamer is a low-foaming nonionic surfactant and a polyether nonionic surfactant.

[0048] The method for using the weld seam coolant of straight seam submerged arc welding of steel pipes according to the present invention comprises the following steps:

[0049] (1) Place the steel pipe 1 made of X60 on the rotating roller 8 of the welding trolley 7. During welding, the welding trolley can move at a constant speed from left to right throu...

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Abstract

The invention discloses welding seam cooling liquid for use in longitudinal submerged arc welding of steel pipes and a use method thereof. The welding seam cooling liquid for use in longitudinal submerged arc welding of the steel pipes comprises the following specific components in percentage by mass: 5-10 percent of polyvinyl alcohol, 10-15 percent of ethylene glycol, 10-15 percent of propylene glycol, 2-5 percent of glycerol, 1-3 percent of sodium nitrate, 0.5-1 percent of potassium hydroxide, 0.5-1.5 percent of an antifoaming agent, 0.1-1.5 percent of an anticorrosive agent and the balance of deionized water. Through adoption of the welding seam cooling liquid, the cooling speed of a welding seam is increased, and the deformation and cracking of the welding seam are avoided. Meanwhile, the high-temperature retention time of the welding seam is shortened, coarse grains in a weld microstructure are prevented, and the strength and toughness of the welding seam are enhanced.

Description

technical field [0001] The invention relates to the technical field of cooling fluid, in particular to a cooling fluid for straight seam submerged arc welding of steel pipes and a method for using the same. Background technique [0002] Submerged arc welding is to spread granular flux on the welding line in advance, through the wire feeding device, the welding wire is automatically and continuously fed into the flux, and the arc is ignited between the front end of the welding wire and the base metal to perform automatic arc welding. When the arc is ignited, the flux, welding wire and base metal melt immediately under the action of the arc heat and form a molten pool. The molten slag covers the metal in the molten pool and the high-temperature welding area to play a protective role. [0003] Longitudinal submerged arc welding can be used to produce large-diameter, thick-walled pipeline steel, which is often used in oil and gas transportation. During welding, the metal to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/10B23K9/18
CPCB23K9/18B23K37/003B23K2101/06B23K2103/04C09K5/10
Inventor 姚正军林玉划罗西希吴小凤杨红勤张泽磊徐尚君
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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