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Welding method for TP347H austenite stainless steel thin-wall pipe

A technology of austenitic stainless steel and welding method, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of difficult placement of soluble paper, difficult quality assurance, complicated construction process, etc., and achieve high deposition efficiency and welding Excellent seam metal, easy installation and maintenance

Active Publication Date: 2017-01-11
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The construction process of this welding method is more complicated, the preparation work before welding is more, and the construction is more inconvenient. For some fixed ports, it is not easy to install soluble paper, it is difficult to construct according to this method, and the quality is not easy to guarantee.

Method used

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  • Welding method for TP347H austenite stainless steel thin-wall pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A welding method for TP347H austenitic stainless steel, comprising the following steps:

[0053] Step 1. Prepare the groove of TP347H austenitic stainless steel. The groove is a V-shaped groove, the groove angle is 60°, the gap is 2mm, and the blunt edge is 0.5mm; if the gap is too small, it will easily cause incomplete penetration, and if the gap is too large, it will be filled with metal If the amount is large, the welding speed will be relatively slowed down, and the temperature will rise, which will easily lead to overheating of the back side and affect the welding quality.

[0054] Step 2. Use a degreasing agent to remove oil, dirt, and scale impurities within 20mm on both sides of the groove at a temperature of 40°C, and clean the groove surface and welding wire with acetone; the degreasing agent is composed of the following raw materials in parts by weight : 10 parts of sodium phosphate, 10 parts of sodium carbonate, 1 part of OP-10, 20 parts of sodium silicate. ...

Embodiment 2

[0080] A welding method for TP347H austenitic stainless steel, comprising the following steps:

[0081] Step 1. Prepare TP347H austenitic stainless steel grooves, the grooves are V-shaped grooves, the groove angle is 70°, the gap is 2.5mm, and the blunt edge is 1mm;

[0082] Step 2. Use a degreasing agent to remove oil, dirt, and scale impurities within 20mm on both sides of the groove at a temperature of 40°C, and clean the groove surface and welding wire with acetone; the degreasing agent is composed of the following raw materials in parts by weight : 16 parts of sodium phosphate, 12 parts of sodium carbonate, 2 parts of OP-10, 30 parts of sodium silicate.

[0083] Step 3. Use the welding wire to perform the first layer welding, the second layer welding and the third layer welding process on the groove welding place in sequence; the process parameters of the first layer welding are: welding voltage is 15V, welding current is 83A, welding speed is 45mm / min, the weld seam thi...

Embodiment 3

[0107] A welding method for TP347H austenitic stainless steel, comprising the following steps:

[0108] Step 1. Prepare TP347H austenitic stainless steel grooves, the grooves are V-shaped grooves, the groove angle is 65°, the gap is 2.25mm, and the blunt edge is 0.8mm;

[0109] Step 2. Use a degreasing agent to remove oil, dirt, and scale impurities within 30mm on both sides of the groove at a temperature of 40°C, and clean the groove surface and welding wire with acetone; the degreasing agent is composed of the following raw materials in parts by weight : 13 parts of sodium phosphate, 11 parts of sodium carbonate, 1.5 parts of OP-10, 25 parts of sodium silicate.

[0110] Step 3. Use the welding wire to perform the first layer welding, the second layer welding and the third layer welding process on the groove welding place in sequence; the process parameters of the first layer welding are: welding voltage is 13V, welding current is 80A, and welding speed is 50mm / min, the weld...

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Abstract

The invention discloses a welding method for a TP347H austenite stainless steel thin-wall pipe. The welding method comprises the following steps: step I, preparing a TP347H austenite stainless steel groove which is a V-shaped groove with a groove angle of 60-70 degrees, a gap of 2-2.5mm and a truncated edge of 0.5-1mm; step II, removing oil, dirt and oxide scale impurities within a range of 20-40mm from the two sides of the groove by use of an oil remover, and cleaning the surface of the groove and a welding wire by use of acetone; step III, sequentially carrying out a first-layer welding process, a second-layer welding process and a third-layer welding process on a groove welded part by use of the welding wire, wherein the welding wire is composed of stainless steel outer skin and a flux core, and the flux core consists of the following raw materials: magnesium oxide, yttrium oxide, sodium fluosilicate, calcium fluoride, calcium carbonate, aluminum oxide, nitrogen containing ferrochromium, ferrocolumbium, electrolytic manganese, metal nickel, cerium oxide, lanthanum oxide, calcium fluozirconate, vanadium metal and iron powder. According to the welding method disclosed by the invention, argon gas does not needed to be introduced for protecting in a welding process, and process operations are simple, so that obtained welding seam metal has the advantages of excellent mechanical performance and mechanical property.

Description

technical field [0001] The invention relates to a welding method of stainless steel, more specifically to a welding method of TP347H austenitic stainless steel. Background technique [0002] TP347H austenitic stainless steel has high mechanical properties and corrosion resistance reserves, but because of its high crack tendency in the process of welding and post-weld stabilization heat treatment, its popularization and application in engineering practice is greatly restricted. Obstacles, especially for the application of thick-walled pipes are more significant. [0003] At present, the domestic TP347 austenitic stainless steel must be back filled with argon for protection during welding to prevent oxidation and burning of the alloy structure at the root of the weld. The quality of argon filling protection in the tube directly affects the welding quality and plays a key role in eliminating overburning defects. This requires the purity of argon gas to reach more than 99.99%,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K35/368B23K35/40B23K103/04
CPCB23K31/02B23K35/368B23K35/406B23K2103/05
Inventor 顾明叶晓军高东昉曹强
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG