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Efficient welding method for 4130 high-pressure pipe

A welding method and high-pressure pipe technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of slow welding speed, high application cost, and low deposition efficiency, and achieve stable arc, easy parameter setting, and high efficiency The effect of continuous welding

Inactive Publication Date: 2017-11-24
NANTONG ZHENHUA HEAVY EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the welding of high-strength medium-carbon quenched and tempered alloy steel such as 4130 in domestic marine products generally adopts argon arc welding + manual electrode arc welding, which has high requirements for welding, electrode baking and recycling; at the same time, this method Low deposition efficiency, slow welding speed, high application cost, large spatter, high probability of porosity, and poor slag removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-efficiency welding method for 4130 high-pressure pipes. The high-efficiency welding of 4130 high-pressure pipes is completed through the selection of welding materials, gas selection and welding control process steps; the specific steps are as follows:

[0019] (1) Selection of welding consumables: argon arc welding and flux cored wire gas shielded welding are selected for common welding;

[0020] (2) Gas selection: choose Ar gas with a purity of 75% and CO with a purity of 25% 2 mixed protective gas;

[0021] (3) Welding control process:

[0022] a. The groove of the high-pressure pipe is prepared by machining, and the oil, rust, oxide and other impurities within 20mm around the groove of the weld are cleaned before welding until the metallic luster is exposed;

[0023] b. When the high-pressure pipe is assembled, the inner wall is flush, and if there is a misalignment, the misalignment value is 0-3mm;

[0024] c. Electric preheating is used for the area to b...

Embodiment 2

[0030] A high-efficiency welding method for 4130 high-pressure pipes. The high-efficiency welding of 4130 high-pressure pipes is completed through the selection of welding materials, gas selection and welding control process steps; the specific steps are as follows:

[0031] (1) Selection of welding consumables: argon arc welding and flux cored wire gas shielded welding are selected for common welding;

[0032] (2) Gas selection: choose Ar gas with a purity of 75% and CO with a purity of 25% 2 mixed protective gas;

[0033] (3) Welding control process:

[0034] a. The groove of the high-pressure pipe is prepared by machining, and the oil, rust, oxide and other impurities within 30mm around the groove of the weld are cleaned before welding until the metallic luster is exposed;

[0035] b. When the high-pressure pipe is assembled, the inner wall is flush, and if there is a misalignment, the misalignment value is 0-3mm;

[0036] c. Electric preheating is used for the area to b...

Embodiment 3

[0042] A high-efficiency welding method for 4130 high-pressure pipes. The high-efficiency welding of 4130 high-pressure pipes is completed through the selection of welding materials, gas selection and welding control process steps; the specific steps are as follows:

[0043] (1) Selection of welding consumables: argon arc welding and flux cored wire gas shielded welding are selected for common welding;

[0044] (2) Gas selection: choose Ar gas with a purity of 75% and CO with a purity of 25% 2 mixed protective gas;

[0045] (3) Welding control process:

[0046] a. The groove of the high-pressure pipe is prepared by machining, and the oil, rust, oxide and other impurities within 25mm around the groove of the weld are cleaned before welding until the metallic luster is exposed;

[0047] b. When the high-pressure pipe is assembled, the inner wall is flush, and if there is a gap, the value of the gap is 1.5mm;

[0048] c. Electric preheating is used for the area to be welded of...

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Abstract

The invention discloses an efficient welding method for a 4130 high-pressure pipe. Efficient welding of the 4130 high-pressure pipe is finished through the technology steps of welding material selection, gas selection and welding control. According to the efficient welding method, flux-cored wire gas shielded welding is used, efficient continuous welding can be achieved, the deposition rate of flux-cored wire gas shielded welding is 3 times of the deposition rate of original manual welding stick electric arc welding, the speed of manual welding stick electric arc welding is 1.5 kg / h, the speed of flux-cored wire CO2 gas shielded welding is 4.5 kg / h, the deposition efficiency of a flux-cored wire reaches 90%, and the deposition efficiency of a manual welding stick is only 65%.

Description

technical field [0001] The invention relates to a welding method, in particular to a high-efficiency welding method for 4130 high-pressure pipes. Background technique [0002] The 4130 high-pressure piping system is a very critical and core component of the high-pressure cement and mud system of the jack-up drilling platform. At present, the welding of high-strength medium-carbon quenched and tempered alloy steel such as 4130 in domestic marine products generally adopts argon arc welding + manual electrode arc welding, which has high requirements for welding, electrode baking and recycling; at the same time, this method The deposition efficiency is low, the welding speed is slow, the application cost is high, the spatter is large, the probability of porosity is high, and the slag removal is also poor. Contents of the invention [0003] The object of the present invention is to address the deficiencies of the prior art, and now provide a high-efficiency welding method for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235
CPCB23K9/173B23K9/235
Inventor 田小林杜高峰
Owner NANTONG ZHENHUA HEAVY EQUIP MFG
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