Butt welding method for T23 steel tubes

A steel pipe and butt welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of decreased toughness of welded joints, and achieve the effect of increasing welding speed, reasonable control, and easy welding of molten pool

Active Publication Date: 2013-02-20
STATE GRID CORP OF CHINA +1
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  • Abstract
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Problems solved by technology

During the welding process of the existing manual butt welding method, there will b

Method used

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Embodiment Construction

[0017] The present invention will be described in further detail below in combination with specific embodiments.

[0018] In summary, the present invention discloses a T23 steel pipe butt welding method, 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 80 / 120A, wherein 80A is the base value current, 120A is the peak current, the voltage adopted is 11V, the pulse frequency of pulse tungste...

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Abstract

The invention discloses a butt welding method for T23 steel tubes. 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 tubes, 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 T23 steel pipe butt welding method. 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] T23 steel is a strong and tough ferritic steel, and the weld toughness is sensitive to the welding method and cooling rate after welding. In the welding process of the existing manual butt welding method, there will be a problem that the toughness of the welded joint will decrease and affect the use. Contents...

Claims

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Application Information

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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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