A method for evaluating the quality of butt welding of plastic pipes

A technology for 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 large influence of subjective factors, long evaluation time and low reliability.

Active Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for evaluating the quality of butt welding of plastic pipes
  • A method for evaluating the quality of butt welding of plastic pipes
  • A method for evaluating the quality of butt welding of plastic pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The method of evaluating the quality of butt welding of plastic pipes is as follows:

[0083] S1. Take the hot-melt butt welded pipe 1 prepared above, and take 10 tensile samples uniformly along the radial direction of the pipe, and use a milling cutter to process it into the dumbbell shape of 1B in GB / T 1040.2-2006, so that the weld is in the sample the center position of

[0084] S2. mill out two symmetrical V-shaped notches (angle is 30°) with the milling cutter at the two ends of the weld position of the 10 dumbbell-shaped tensile samples prepared, and the notch depth is 2mm (the notch depth is the same as the strip shape The ratio of the length of the welding wire on the tensile sample is 1:4);

[0085] S3. The dumbbell-shaped tensile sample with the V-shaped notch obtained in step S2 was stretched at a speed of 9 m / s with a high-speed tensile testing machine, and the tensile strength of the sample was measured as shown in Table 4. The calculated coefficient of v...

Embodiment 2

[0087] The method of evaluating the quality of butt welding of plastic pipes is as follows:

[0088] S1. Take the hot-melt butt welding pipe 2 prepared above, and take 10 tensile samples uniformly along the radial direction of the pipe, and use a milling cutter to process it into a dumbbell shape of 1B in GB / T 1040.2-2006, so that the weld is in the sample the center position of

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

[0090] S3. the dumbbell-shaped tensile sample with V-shaped notch obtained by step S2 is stretched at a speed of 9m / s with a high-speed tensile testing machine, and the tensile strength of the sample is recorded as shown in table 4, Among them, the coefficient of variation between the meas...

Embodiment 3

[0093] The method of evaluating the quality of butt welding of plastic pipes is as follows:

[0094] S1. Take the hot-melt butt welding pipe 3 prepared above, and take 10 tensile samples evenly along the radial direction of the pipe, and process them into the dumbbell shape of 1B in GB / T 1040.2-2006 with a milling cutter, so that the weld is in the sample the center position of

[0095] S2. mill out two symmetrical V-shaped notches (the angle is 90°) with the milling cutter at the two ends of the welding seam of the 10 dumbbell-shaped tensile samples prepared, and the notch depth is 2mm (the notch depth is the same as the strip shape The ratio of the length of the welding wire on the tensile sample is 1:3);

[0096] S3. the dumbbell-shaped tensile sample with V-shaped notch obtained by step S2 is stretched at a speed of 9m / s with a high-speed tensile testing machine, and the tensile strength of the sample is recorded as shown in table 4, Among them, the coefficient of variat...

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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 hot-melt butt welding of plastic pipes, in particular to a method for evaluating the quality of hot-melt butt welding of plastic pipes. Background technique [0002] Plastic pipes have been widely used in gas transportation, water supply and drainage, sewage discharge, agricultural irrigation, and mine fine particle solid transportation due to their advantages of light weight and low price, high specific strength, high specific stiffness, wear resistance, and good chemical corrosion resistance. , as well as fields such as oil field, chemical industry and post and telecommunications. [0003] During the manufacture and installation of plastic piping systems, the connections between pipes are an important factor affecting their structural integrity and lasting strength. Therefore, the welding technology and performance evaluation of pipes are one of the key technologies that affect whether plastic pipes are widely u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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