Electrofusion welding of polyethylene/carbon black composites

doi:10.19491/j.issn.1001-9278.2023.10.015

Abstract

Abstract:

In this study， the polyethylene/carbon black composites for pipelines were prepared through melt blending carbon black with polyethylene. The resultant welding composites were further used to weld pipelines under different welding conditions including single⁃program welding and multi⁃program welding， and the welding properties， mechanical properties， crystallization properties， and microscopic morphology of the welded pipes were studied. The results indicated that the processing temperature of the extruder should not exceed 240 ºC， and the screw speed should not exceed 40 rpm. This can effectively avoid the defects of uneven dispersion of carbon black and bubble in the preparation process of pipeline. In the single⁃stage welding process， the temperature was found to rise sharply at the end of the experiment. However， the temperature of the melting zone could keep in a relatively stable range in the multi⁃stage welding procedure. The tensile stripping test results indicated that the welding performance of welded samples obtained from the multi⁃stage welding process was better than that from the single⁃stage welding process.

Key words: polyethylene, electrofusion welding, welding performance

CLC Number:

TQ325.1⁺2

WANG Bin, WANG Zhenchao, HE Anqi, CHENG Debao, WANG Yaru, ZHAO Xiaoying, XIANG Aimin. Electrofusion welding of polyethylene/carbon black composites[J]. China Plastics, 2023, 37(10): 111-116.

Figures/Tables 12

加工工艺

加料口

温度/℃

共混段

温度/℃

模口

温度/℃

转速/

r·min^-1

Tab.1. Extrusion process of PE/ carbon black blends

样品	最大力/N	拉伸强度 /MPa	断裂拉伸应变/%
基体	475.43±11.17	31.46±1.32	1 638.95±44.33
工艺1	296.23±1.95	18.90±0.12	63.12±2.69
工艺2	433.13±38.40	27.94±2.12	1 372.51±73.40

Tab.2. Mechanical properties of PE/ carbon black composites

Fig.1. Polarization diagram of PE/ carbon black composites

Fig.2. Relationship between resistance and temperature and temperature⁃time relationship of electricfusion welding

样品	实验参数
a	11 A、150 s
b	11 A、120 s；9 A、200 s
c	11 A、140 s；10.5 A，、0 s；10 A、180 s

Tab.3. Welding parameter table

Fig.3. Temperature⁃time relationship of electricfusion welding

Fig.4. Welding fracture diagram under the same welding current and different welding time

Fig.5. Mechanical properties of welding surface with welding time under single⁃stage welding

样品	实验参数
a	13 A、140 s
b	13 A、120 s；12.5 A、20 s
c	13 A、100 s；12.5 A、20 s；12 A、20 s
d	13 A、80 s；12.5 A、20 s；12 A、20 s；11.5 A、20 s

Tab.4. Experimental parameters of multi⁃stage welding procedure

Fig.6. Multi⁃stage program tensile stripping experiment

样品	最大力/N	剥离脆性百分比/%	焊接性能/%
a	599.51	35.495	65.51
b	804.37	23.65	76.35
c	859.99	18.49	81.51
d	949.51	4.40	95.60

Tab.5. Welding properties of multi⁃stage welding

Fig.7. Thermal properties and tensile strength of PE，PE/carbon black composites and composites after electrofusion welding

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