Electrofusion welding process for preventing generation of cold welding and over welding defects and electrofusion welder

A technology of electric fusion welding and welding circuit, which is applied in the field of electric fusion welding machine, can solve the problems of different welding time and different welding input power, and achieve the effect of avoiding over welding

Active Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

But the welding time is not directly related to the temperature value of the electrofusion welding interface, and in fact, because the resistance wire process of different manufacturers is different, even if the welding voltage is the same, the welding input power is different, so the required The welding time is also different

Method used

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  • Electrofusion welding process for preventing generation of cold welding and over welding defects and electrofusion welder
  • Electrofusion welding process for preventing generation of cold welding and over welding defects and electrofusion welder
  • Electrofusion welding process for preventing generation of cold welding and over welding defects and electrofusion welder

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specific Embodiment

[0041] (1) Obtain the input parameters of electrofusion joint welding

[0042] After the power connector of the electric fusion welding machine is connected, the welding machine starts to detect whether the electric fusion sleeve has been connected. Usually the resistance value in the electrofusion sleeve is between 0.5 and 10Ω, by applying a low voltage DC voltage U at the output terminal of the electrofusion welding machine t , while detecting the current. If the current is detected and the value is 0.1U t ~2U t In between, the circuit is considered to be connected. After the current is stable, the measured current value through the circuit is I t , then the initial resistance value of the electrofusion sleeve is:

[0043] R 0 = U t I t - - - ( 5 )

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Abstract

The invention which relates to an electrofusion welder technology aims to provide an electrofusion welding process for preventing the generation of cold welding and over welding defects and an electrofusion welder. The process comprises the following steps: 1, measuring the current and the voltage of a welding circuit in real time in the welding process to obtain the resistance value change case of a resistance wire, controlling the voltage of the welding circuit to realize the control on the resistance value of the resistance wire and the welding power, and simultaneously controlling the temperature of a polyethylene material around the resistance wire in the welding process; and 2, recording the real-time welding power of the resistance wire in the welding process, carrying out accumulating calculation to obtain welding input heat, and ending the welding when the welding input heat reaches the value of total heat Q needed by the welding completion through an electrofusion sleeve. According to the invention, the electrofusion welder can automatically determine a reasonable welding technology only through giving the needed welding input heat. A present digital welder which can be conveniently added with the control forms the novel electrofusion welder with the cold welding and over welding prevention functions.

Description

technical field [0001] The invention relates to the electric fusion welding machine technology, in particular to an electric fusion welding method and an electric fusion welding machine capable of preventing cold welding and over-welding defects. Background technique [0002] In recent years, the adjustment of my country's energy structure and policies and the further implementation of important energy strategic plans such as the West-East Gas Pipeline have brought huge room for development to my country's gas pipeline industry. Plastic pipes and thermoplastic reinforced plastic composite pipes have been rapidly developed and applied in various industries due to their excellent comprehensive mechanical properties. Electrofusion welding is one of the most important connection methods for plastic pipes and composite pipes, especially for composite pipes used in some complex and harsh environments (such as high pressure, mud, etc.), electrofusion welding is almost the only appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/02
Inventor 郑津洋施建峰郭伟灿徐成
Owner ZHEJIANG UNIV
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