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Ferritic steel barrel butt-junction circular-seam hot-wire TIG multi-layer multipath welding method

A low-alloy steel, multi-layer and multi-channel technology, applied in welding equipment, heat treatment furnace, arc welding equipment, etc., can solve the problems of low deposition efficiency and long processing cycle, so as to improve processing quality, reduce processing cost, prevent The effect of slag accumulation

Inactive Publication Date: 2009-03-25
HARBIN JIANCHENG GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a low-alloy steel cylinder butt ring seam hot wire TIG multi-layer multi-pass welding method, which solves the problem of the existing low-alloy steel cylinder Body butt girth welding has the problems of low deposition efficiency and long processing cycle when using cold wire TIG filler welding

Method used

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  • Ferritic steel barrel butt-junction circular-seam hot-wire TIG multi-layer multipath welding method
  • Ferritic steel barrel butt-junction circular-seam hot-wire TIG multi-layer multipath welding method
  • Ferritic steel barrel butt-junction circular-seam hot-wire TIG multi-layer multipath welding method

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specific Embodiment approach 1

[0025] Specific implementation mode 1: The specific process of the low-alloy steel cylinder butt circular seam hot wire TIG multi-layer multi-pass welding method described in this implementation mode is:

[0026] Step 1. Process the bevels of the end surfaces of the cylinders to be welded: respectively turn the welded end surfaces of the two cylinders to be welded into U-shaped bevels with blunt edges that cooperate with each other;

[0027] Step 2. Welding the U-shaped groove, which specifically includes the following steps:

[0028] Step 21. Pre-welding and preheating the two tubes to be welded: After assembling the two tubes to be welded in place, pre-weld and preheat the furnace. The heating temperature is 280-300°C, and the holding time is 120± 5 minutes to make the product heated evenly;

[0029] Step 22, the test piece processed in step 21 is released from the oven, put into the fixture of the automatic welding machine, adjust the relative position of the welding torch...

specific Embodiment approach 2

[0047] Specific embodiment 2: The difference between this embodiment and the specific embodiment is that the low-alloy steel cylinder butt ring seam hot wire TIG multi-layer multi-pass welding method is that the wall thickness S of the cylinder to be welded is 15mm- 50mm, the difference of the welding method is:

[0048] In the bottom welding process of step two or three, a welding wire with a diameter of Φ1.2mm is used, the welding current is 145A to 160A, the arc length is 3mm to 4mm, the corresponding voltage is 12V to 14V, and the speed is 120mm / min. The diameter is 4mm~5mm, the end angle of the tungsten pole is 30°~40°, the length of the tungsten pole protruding from the protective nozzle 3 is 6mm~8mm, the inner diameter of the protective nozzle 3 is 11mm, and the gas flow rate is 18L / min~22L / min, welding torch advance is 25mm~30mm,

[0049] Refer to Table 1 for the program parameter setting of TIG welding:

[0050] Table 1

[0051]

TORCH PREGAS

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Abstract

Disclosed is a hot filament TIG multi-layer and multi-track welding method for low alloy steel cylinder butt joint girth welding, relating to a low alloy steel cylinder butt joint girth welding method which solves the problems in the prior low alloy steel cylinder butt joint girth welding that the welding deposition rate of the cold filament TIG filling welding is low so as to result in low product qualification ratio and the long process cucle. The welding process includes: firstly, processing the slope mouth of the end face the awaiting welding cylinder piece; secondly, processing the welding for the U-shape slope mouth, pre-welding and preheating for the two awaiting welding cylinder pieces, performing bottom welding, multi-layer and multi-track filling welding and multi-layer and multi-track cap welding; thirdly, post-heating and degassing hydrogen; fourthly, stress removing and annealing; fifthly, modifying and quenching. The cylinder butt joint welding by the invention can increase the welding deposition ratio of the welding filament by 2 to 3 times and greatly increase the product qualification ratio by first delivery check. The method of the invention is particularly applicable to the 35CrMnSiA alloy cylinder butt joint welding.

Description

technical field [0001] The invention relates to a welding method for butt joint girth seam of a low-alloy cylinder. Background technique [0002] The existing low-alloy steel cylinder butt girth welding generally adopts the electron beam welding process, but due to the imperfect adjustment and matching of the process parameters of the electron beam welding, defects such as incomplete fusion, cracks, and penetrating shrinkage holes appear in the weld, It cannot meet the quality requirements of the product, and the passing rate of the first inspection is only 55%. The repair process of unqualified products is also relatively complicated, which increases the labor cost, and also increases the processing cycle and processing cost of the product. Contents of the invention [0003] The purpose of the present invention is to provide a low-alloy steel cylinder butt joint girth seam hot wire TIG multi-layer multi-pass welding method, which solves the existing low-alloy steel cylind...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/133B23K9/095C21D9/08C21D1/30C21D1/18
Inventor 徐中山邹玉宏侯玉华周健
Owner HARBIN JIANCHENG GRP
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