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Method for determining minimum melting zone depth by considering out-of-roundness and fit tolerance of electric melting joint

A technology of matching tolerances and electrofusion joints, applied in complex mathematical operations, etc., can solve problems such as different depths of electrofusion joints, complicated ultrasonic detection operations, unfavorable depths of electrofusion welding areas, etc., and achieve the effect of saving enterprise costs

Active Publication Date: 2021-08-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, there are still some deficiencies in the existing methods. For example, the temperature field model has been simplified, and the out-of-roundness and matching dimension tolerances in processing are not considered; the ultrasonic testing operation is complicated, and its implementation has great limitations, which is not conducive to Grasp the depth of the fusion zone in engineering; the depth of the fusion zone of large and small specifications is different, and there is no general standard. It is obviously not suitable to conduct electrofusion welding according to the unified recommended depth of fusion zone given by existing patents. Large diameter

Method used

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  • Method for determining minimum melting zone depth by considering out-of-roundness and fit tolerance of electric melting joint
  • Method for determining minimum melting zone depth by considering out-of-roundness and fit tolerance of electric melting joint
  • Method for determining minimum melting zone depth by considering out-of-roundness and fit tolerance of electric melting joint

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Effect test

Embodiment 1

[0069] According to the present invention, the minimum melting area of ​​the tube and a nominal diameter of 90 mm is required for the nominal diameter of 90 mm in accordance with the minimum melt region depth determination method of the non-metallic melting tolerance of the molten joint, and the nominal diameter is 90 mm. min Calculation. Minimum average outer diameter D em，min = 90mm, maximum average outer diameter of pipe D em，max = 90.6mm, minimum average outer diameter of the pipe em，min = 90mm, maximum average outer diameter of the pipe em，max = 90.6mm, maximum dispensing of pipe X max = 1.8mm, minimum incapacity of pipe X min = 0mm, the maximum inclination of the pipe max = 1.35mm, minimum incapacity of the pipe min = 0mm.

[0070] The specific measurement process is as follows:

[0071] 1. Determine the mean value of the tubular mean by the following formula (13) and (14) D b And the tube mean is not rounded D b

[0072]

[0073] Where X max - Maximum urination, X min - ...

Embodiment 2

[0099] According to the present invention, the minimum melting of tubular materials and nominal diameter of 160 mm are tubular and nominal diameter of 160 mm in the nominal diameter of 160 mm in accordance with the present invention, considering the non-melting of the electric melt fitting tolerance. Area depth δ min Calculation. Minimum average outer diameter D em，min = 160mm, maximum average outer diameter D em，max = 161mm, minimum average outer diameter of the pipe member D em，min = 160mm, the maximum average outer diameter of the pipe em，max = 161mm, maximum inclination X max = 3.2mm, tube minimum incapacity x min = 0mm, the maximum inclination of the pipe max = 2.4mm, minimum incapacity of the pipe min = 0mm.

[0100] The specific measurement process is as follows:

[0101] 1. Determine the mean value of the tubular mean by the following formula (21) and (22) D b And the tube mean is not rounded D b

[0102]

[0103] Where X max - Maximum urination, X min - The minimum inc...

Embodiment 3

[0129] According to the present invention, the minimum melting of tubular members having a nominal diameter of 200 mm is a tube and a nominal diameter of 200 mm, considering the unfoundation of the electric melt joint and the mating tolerance. Area depth δ min Calculation. Minimum average outer diameter D em，min = 200mm, the maximum average outer diameter of the pipe em，max = 201.2mm, the minimum average outer diameter of the pipe em，min = 200mm, the maximum average outer diameter D of the pipe em，max = 201.2mm, maximum dispensing of pipe X max = 4mm, minimum incapacity X min = 0mm, the maximum inclination of the pipe max = 3mm, minimum incapacity of the pipe min = 0mm.

[0130]The specific measurement process is as follows:

[0131] 1. Determine the mean value of the tubular mean by the following formula (29) and (30) D b And the tube mean is not rounded D b

[0132]

[0133] Where X max - Maximum urination, X min - The minimum incapacity of the pipe is the largest inclusion o...

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Abstract

The invention relates to an electrofusion joint welding technology, and aims to provide a minimum fusion zone depth determination method considering out-of-roundness and fit tolerance of an electrofusion joint. The method comprises the following steps: determining the mean value out-of-roundness db of a pipe and the mean value out-of-roundness Db of an electric smelting pipe fitting; calculating the actual sizes of the pipes and the electric melting pipe fittings after processing; calculating a gap e according to the out-of-roundness and fit tolerance of the pipe and the electric melting pipe fitting; calculating the mean value mu e of the gap e and the standard deviation sigma e of the gap e; selecting the minimum melting zone depth delta min according to the confidence coefficient; and fitting a function relationship between the pipes dn with different nominal diameters and the minimum melting zone depth delta min. By means of the method, the minimum fusion zone depth needed by a qualified connector for electric fusion welding when pipes and pipe fittings with different diameters are matched can be obtained, and optimization of the welding process of an electric fusion welding machine is facilitated. The welding quality can be judged by referring to the depth of the melting zone, a manufacturer can perform welding according to a melting zone depth calculation formula, the welding time does not need to be determined through a test, and the enterprise cost is saved.

Description

Technical field [0001] The present invention relates to welding techniques of a flash melt joint, and more particularly to a method of determining a minimum melting area depth in consideration of the inclusion tolerance of the electric melter. Background technique [0002] In the large background of energy structures and energy saving and emission reduction, polyethylene tubes are characterized by good toughness, corrosion resistance, good welding performance, long service life, and the development of "plastic steel", polyethylene tube Being the best choice for more and more fields. [0003] There are three ways to connect the polyethylene tube: electric fuse welding, hot melt welding, mechanical connection. Among them, the electric fuse welding is better than other two aspects of the welding, the requirements are simple, welded quality and welding efficiency, and are widely used in polyethylene connections, which have more common engineering applicability. [0004] Electrical fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06F17/15
CPCG06F17/18G06F17/15
Inventor 曹雨桦任亦心胡裕锐施建峰郑津洋
Owner ZHEJIANG UNIV