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Induction heater for performing postweld heat treatment on small-diameter pipe welding head without cooling and manicuring method of induction heater

A post-weld heat treatment and induction heater technology, which is applied in the field of heat treatment, can solve problems such as heat treatment of welded joints of small-diameter pipes that are difficult to handle, and achieve the effects of reducing deformation, prolonging life, and improving overall strength

Active Publication Date: 2019-12-13
POWER CHINA HENAN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a non-cooling induction heater for post-weld heat treatment of small-diameter pipe welding head and its manufacturing method. , by designing the inductor as a sheet-like serpentine veneer structure, it solves the problem of heat treatment of small-diameter pipe welding joints that is difficult to handle with traditional copper pipes

Method used

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  • Induction heater for performing postweld heat treatment on small-diameter pipe welding head without cooling and manicuring method of induction heater
  • Induction heater for performing postweld heat treatment on small-diameter pipe welding head without cooling and manicuring method of induction heater
  • Induction heater for performing postweld heat treatment on small-diameter pipe welding head without cooling and manicuring method of induction heater

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Experimental program
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Effect test

Embodiment 1

[0049] Such as figure 1 Shown: First process pure copper into the required shape and size according to the heat treatment requirements of φ45mm single tube, then recrystallize and anneal it to reduce the hardness, and then bend it into such image 3 If the semi-circular arc shape is shown and electroless plating is performed, the conductive layer 32 of the sensor is made. After bonding the inductor insulation layer 31 on the mold, place the inductor conductive layer 32, then bond the inductor insulation layer 33, and then dry to obtain two sheet-like serpentine veneer semicircular arc inductors. The two sheet-like snake-shaped veneer semi-circular arc inductors are combined mechanically, and the welding seam can be heated by passing an electric current.

Embodiment 2

[0051] Such as figure 2 Shown: First process pure copper into the required shape and size according to the heat treatment requirements of φ70mm single tube, then perform recrystallization annealing to reduce the hardness, and then bend it into such image 3 As shown in the continuous semi-circular arc shape, there is a natural transition between the arcs, and then electroless plating is performed to form the conductive layer 32 of the inductor. After bonding the inductor insulation layer 31 on the mold, place the inductor conductive layer 32, then bond the inductor insulation layer 33, and then dry to obtain two sheet-like serpentine veneer semicircular arc inductors. The two sheet-like snake-shaped veneer semi-circular arc inductors are combined mechanically, and the welding seam can be heated by passing an electric current.

[0052] The present invention uses a Cu chip with a certain thickness as the inductor, which greatly saves space and solves the problem of heat treatm...

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Abstract

The invention discloses an induction heater for performing postweld heat treatment on a small-diameter pipe welding head without cooling and a manicuring method of the induction heater. A small-diameter conductive inductor is arranged at a welding seam of the outer wall of a small-diameter pipe, is of a sheet sneak-shaped veneered construction, and is divided into a left-side sheet small-diameterpipe conductive inductor and a right-side sheet small-diameter pipe conductive inductor; the sheet small-diameter pipe conductive inductors on two sides are consistent in structure and are of a fan ring structure; the inner ring radius R of a fan ring is equal to the sum of the radius r of the small-diameter pipe and the thickness s of the wall of the small-diameter pipe, that is, R= r + s; the fan ring lengths X1 of the left-side sheet small-diameter pipe conductive inductor and the right-side sheet small-diameter pipe conductive inductor are equal to PiR-s; and the left-side sheet small-diameter pipe conductive inductor and the right-side sheet small-diameter pipe conductive inductor are stuck on the outer wall of the small-diameter pipe in a half-surrounding manner. The induction heaterand the manufacturing method solve the problem that the heat treatment problem of a small-diameter pipe connector is solved difficultly by a traditional copper pipe, reduce a traditional water cooling circulation system, and reduce the cost.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a non-cooling induction heater for post-weld heat treatment of small-diameter pipe welded joints and a manufacturing method thereof, which is suitable for post-weld heat treatment heating of heating surface tubes in thermal power plant boilers. Background technique [0002] The traditional post-weld heat treatment of welded joints of heating surface tubes in thermal power plant boilers adopts flame heating or far-infrared heating. Flame heating is difficult to ensure uniform temperature due to its low efficiency and great influence on operating skills. It is only used for post-weld heat treatment of individual reworked welded joints of medium and low alloy steels. Flexible resistance heating is suitable for pre-welding preheating, post-heating and post-welding heat treatment. Thermocouples are used for temperature measurement, and automatic temperature control equipment is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/42
CPCC21D9/50C21D1/42Y02P10/25
Inventor 汪洋连丽豆志远王顺阳邢增为王顺兴丁光柱孙松涛陈东旭周旭东李世会郭未昀李报陈英权张志坤浮羽田长有胡传华李红武王许永
Owner POWER CHINA HENAN ENG CO LTD
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