2017 №06 (10) DOI of Article
2017 №06 (12)

Avtomaticheskaya Svarka (Automatic Welding), #6, 2017, pp. 68-71
Development of technology of sealing heat exchanger pipes by automatic wet underwater welding

S.Yu. Maksimov
E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail:
One of the alternative sources of energy is heat pumps. The heat exchangers, included into their composition, represent pipes with a diameter of 140–190 mm, going into the ground to the depth of 200 m and filled with a heat-carrying agent: a mixture of water with 25 % of special coolant FXC2 based on antifreeze with corrosion inhibitors. For the heat exchanger sealing a technology for welding-in bottom was developed using automatic flux-cored wire underwater welding. The influence of coolant and depth on the formation and structure of weld metal were determined, the main parameters of welding process were selected: wire feed speed, rotation speed of automatic machine, inclination angles of torch, optimal gap between the pipe wall and the end of welded-in bottom. A pilot industrial inspection was carried out. 2 Ref., 8 Figures.
Keywords: wet arc welding, low-carbon steel, heat pumps, welding-in of bottom, flux-cored wire, process automation
Received:                21.04.17
Published:               06.07.17
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