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SA-213TP347HFG steel small diameter tube welding method

A technology of SA-213TP347HFG and 1.SA-213TP347HFG is applied in the field of austenitic stainless steel material welding, which can solve the problems such as the welding method of small diameter pipe of SA-213TP347HFG steel, etc., to improve the comprehensive performance of welding seam, reduce welding defects and save money. The effect of working hours

Inactive Publication Date: 2016-07-13
POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, there is no welding method specifically for SA-213TP347HFG steel small diameter pipes in the field

Method used

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  • SA-213TP347HFG steel small diameter tube welding method

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Embodiment Construction

[0020] The present invention will be further explained and illustrated below in conjunction with the accompanying drawings.

[0021] The SA-213TP347HFG steel small-diameter pipe welding method includes the following steps:

[0022] a) Pre-welding treatment: process the SA-213TP347HFG steel small-diameter pipe fitting 1 to form a V-shaped groove, the single-side groove angle is 33-38°, and grind the groove;

[0023] b) Control the welding environment: temperature ≥ 0 ℃, wind speed ≤ 2m / s, relative humidity ≤ 75%. Since the diameter of the pipe fitting to be welded is relatively small (the diameter is generally not greater than 76mm), the deformation of the pipe fitting 1 to be welded can be reduced, and the direction of the arc can be stabilized;

[0024] c) Use manual tungsten argon arc welding (TIG) to weld the pipe fittings to be welded: choose an argon arc welding machine with high-frequency arc ignition and current attenuation, and the arc length during welding is 1-2.5mm...

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Abstract

The invention relates to the field of austenitic stainless steel material welding, in particular to an SA-213TP347HFG steel small diameter tube welding method.The method comprises the following steps: 1, conducting treatment before welding, wherein a V-shaped groove is machined out of an SA-213TP347HFG steel small diameter tube to be welded, the single-side groove angle is 33-38 degrees, and grinding treatment is conducted on the groove; 2, controlling the welding environment, wherein the temperature is higher than or equal to 0 DEG C, the air speed is less than or equal to 2 m / s, and the relative humidity is less than or equal to 75%; 3, welding the tube to be welded through manual tungsten inert gas arc welding (TIG), wherein an TIG welding machine with high frequency arc striking and current attenuation is selected, the electric arm length in the welding process is 1-2.5 mm, an ERNiCr-3 welding wire is selected, the welding root is filled with argon and coated with an anti-oxidation protective agent for protection, the argon purity is 99.99%,and the flow rate is 8-15 L / min, narrow weld bead and short bead intermittent welding is adopted, tracking is conducted from time to time for temperature measurement so that the welding interlayer temperature cannot be higher than 70 DEG C, weld lines on each layer are covered with cloth dipped in purified water for cooling, and in the welding process, a slope with length being 7-9 mm is formed through grinding at a joint between each weld line and the previous weld line.

Description

technical field [0001] The invention relates to the field of austenitic stainless steel welding, in particular to a welding method for SA-213TP347HFG steel small-diameter pipes. Background technique [0002] SA-213TP347HFG steel (chrome-nickel-niobium austenitic stainless steel) is a new type of austenitic steel stabilized with niobium, and the grain is obviously refined. It is superior to conventional steel pipes, and has better resistance to intergranular corrosion, good structural stability, more excellent resistance to oxidation and peeling, and also has good bending performance. The overall performance of SA-213TP347HFG is much better than other types of austenitic steel. The steel can be used to manufacture high-temperature superheaters, high-temperature reheaters, high-temperature sections of panel superheaters and various high-temperature and high-pressure resistant pipe fittings for large-scale power generation boilers with subcritical and supercritical pressure pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32
CPCB23K9/167B23K9/235B23K9/32
Inventor 程文俊张彬苗慧霞毛春生
Owner POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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