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Method for evaluating plastic pipe butt-fusion welding quality

A technology of hot-melt butt joint and plastic pipes, which is applied in the direction of applying stable tension/pressure to test the strength of materials, which can solve the problems of low reliability, large influence of subjective factors, and long evaluation time.

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for evaluating the quality of butt welding of plastic pipes in order to overcome the technical problems of low reliability, large influence of subjective factors or long evaluation time in the existing methods for evaluating the quality of butt welding of plastic pipes to improve at least one of the above problems

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  • Method for evaluating plastic pipe butt-fusion welding quality
  • Method for evaluating plastic pipe butt-fusion welding quality
  • Method for evaluating plastic pipe butt-fusion welding quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The methods to evaluate the quality of butt welding of plastic pipes are as follows:

[0083] S1. Take the hot-melt butt-welded pipe 1 prepared above, take 10 tensile specimens uniformly along the radial direction of the pipe, and machine them into a dumbbell-shaped GB / T1040.2-2006 1B, and let the weld be tested The exact center position;

[0084] S2. Use a milling cutter to mill out two symmetrical V-shaped notches (angle of 30°) of the 10 dumbbell-shaped tensile specimens at the two ends of the weld position, and the depth of the notch is 2mm (notch depth and strip The ratio of the length of the welding wire on the tensile specimen is 1:4);

[0085] S3. The dumbbell-shaped tensile specimen with V-notch obtained in step S2 was stretched with a high-speed tensile testing machine at a speed of 9 m / s, and the tensile strength of the specimen was measured as shown in Table 4. Among them, the coefficient of variation between the tensile strength values ​​is calculated to be 0.01...

Embodiment 2

[0087] The methods to evaluate the quality of butt welding of plastic pipes are as follows:

[0088] S1. Take the hot-melt butt-welded pipe 2 prepared above, obtain 10 tensile specimens uniformly along the radial direction of the pipe, and machine them into a dumbbell-shaped GB / T1040.2-2006 1B, and let the weld be tested The exact center position;

[0089] S2. Use a milling cutter to mill out two symmetrical V-shaped notches (angle of 150°) of the 10 dumbbell-shaped tensile specimens at the two ends of the weld, and the depth of the notch is 2mm (the depth of the notch is the same as that of the strip The ratio of the length of the welding wire on the extension sample is 1:6);

[0090] S3. The dumbbell-shaped tensile specimen with V-notch obtained in step S2 is stretched with a high-speed tensile testing machine at a speed of 9m / s, and the tensile strength of the specimen is measured as shown in Table 4. Among them, the coefficient of variation between the tensile strength values ​...

Embodiment 3

[0093] The methods to evaluate the quality of butt welding of plastic pipes are as follows:

[0094] S1. Take the hot-melt butt-welded pipe 3 prepared above, obtain 10 tensile specimens uniformly along the radial direction of the pipe, and machine them into a dumbbell-shaped GB / T1040.2-2006 1B, and let the weld be tested The exact center position;

[0095] S2. Use a milling cutter to mill out two symmetrical V-shaped notches (with an angle of 90°) of the 10 dumbbell-shaped tensile specimens at the two ends of the weld, and the depth of the notch is 2mm (notch depth and strip The ratio of the length of the welding wire on the tensile specimen is 1:3);

[0096] S3. The dumbbell-shaped tensile specimen with V-notch obtained in step S2 is stretched with a high-speed tensile testing machine at a speed of 9m / s, and the tensile strength of the specimen is measured as shown in Table 4. Among them, the coefficient of variation between the tensile strength values ​​is 0.235.

[0097] Since th...

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Abstract

The invention discloses a method for evaluating plastic pipe butt-fusion welding quality. The method comprises S1, preparing a group of strip-shaped tensile samples, wherein the strip-shaped tensile sample has a butt-fusion welding line as a center line and forms symmetrical concave gaps at two sides of the center line, S2, drawing the strip-shaped tensile samples at a high rate of 1-20m / s and detecting tensile strength values and curves and S3, according to the tensile strength values of the strip-shaped tensile samples, calculating a variable coefficient of the tensile strength values, wherein if the variable coefficient is less than 0.15, the plastic pipe butt-fusion welding quality is eligible. Through a high-speed drawing technology, the method shortens test time. Through the variable coefficient of the tensile strength values, plastic pipe butt-fusion welding quality is determined. The method can produce an objective determination result, reduce subjective factor-caused influence and improve determination reliability.

Description

Technical field [0001] The invention relates to the field of butt welding of plastic pipes, in particular to a method for evaluating the quality of butt welding of plastic pipes. Background technique [0002] Plastic pipes have been widely used in gas transportation, water supply and drainage, sewage drainage, agricultural irrigation, and transportation of fine particles in mines due to their advantages of light weight and low price, high specific strength, high specific rigidity, abrasion resistance, and good chemical corrosion resistance. , And the fields of oil field, chemical industry, post and telecommunications. [0003] In the process of manufacturing and laying plastic piping systems, the connection between the pipes is an important factor that affects its structural integrity and durability. Therefore, pipe welding technology and its performance evaluation are one of the key technologies that affect whether plastic pipes are widely used. Among them, hot melt butt welding...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 杨化浩朱天戈者东梅武鹏
Owner CHINA PETROLEUM & CHEM CORP
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