Butt welding method for T23 steel tube and G102 steel tube

A steel pipe and butt welding technology, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of decreased toughness of welded joints and unguaranteed welding quality, and achieves increased welding speed, improved welding quality, and reasonable welding heat input Effect

Active Publication Date: 2015-06-17
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] T23 steel is a strong and tough ferritic steel, and G102 steel is a multi-component composite strengthened steel. If the welding method or welding process parameters are not selected during the welding of two dissimilar steels, the toughness of the welded joint will decrease and affect the use. , welding quality cannot be guaranteed

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  • Butt welding method for T23 steel tube and G102 steel tube

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Embodiment Construction

[0018] To sum up, the present invention discloses a butt welding method of T23 steel pipe and G102 steel pipe, comprising the following steps:

[0019] The first step is to bevel the end of the steel pipe;

[0020] The second step is to assemble the steel pipes to be butt-welded. The ends of the two steel pipes of the pair are in contact, placed horizontally, and the axes of the two steel pipes coincide;

[0021] The third step is to use pulse tungsten argon arc welding to weld the steel pipe.

[0022] The third step includes root layer welding and surface layer welding, and the filling duty ratios formed by root layer welding and surface layer welding are respectively 50%.

[0023] The welding current of the root layer welding step is 70 / 110A, wherein 70A is the base value current, 110A is the peak current, the voltage used is 11V, the pulse frequency of pulse tungsten argon arc welding is 1.5Hz, and the welding speed is 2.9 -3 cm / min.

[0024] The root layer w...

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Abstract

The invention discloses a butt welding method for a T23 steel tube and a G102 steel tube. The method is characterized by including the following steps: step one, preparing grooves at steel tube ends; step two, fitting up steel tubes to be butt-welded which are contacted at ends and horizontally placed with two steel tube axes coinciding; and step three, butt-welding the steel tubes through argon tungsten pulsed arc welding. The method has the advantages that the argon tungsten pulsed arc welding is adopted for the butt welding of the T23 steel tube and the G102 steel tube, therefore the welding speed is improved effectively, and weld heat input can be controlled reasonably; and on the other hand, an operator uses an impulsive force generated in a semi-circle of an welding arc pulse welding peak current under the parameter conditions to control a welding pool easily, and the welding quality is improved greatly.

Description

technical field [0001] The invention relates to a steel pipe welding method, in particular to a butt welding method for a T23 steel pipe and a G102 steel pipe. Background technique [0002] T23 steel is on the basis of T22 steel, reducing carbon content, reducing impurity content, adding microalloying elements, adding solid solution strengthening elements tungsten or molybdenum, and through toughening and processing, it has excellent room temperature performance, welding performance and A steel with good processing performance, the creep rupture strength at 600°C is 1.8 times that of T22, suitable for ultra-supercritical boiler water wall steel with a tube wall temperature below 575°C. [0003] Based on the superior performance of T23 steel, many subcritical and supercritical boiler superheaters and reheaters of thermal power plants in my country use T23 steel pipes to replace the original G102 steel pipes. A large number of T23 and G102 dissimilar steel welded joints have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167
Inventor 王迎军张大刚何生贵焦荣格苏召王秉洪
Owner STATE GRID CORP OF CHINA
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