Automatic Welding, 2017, №06



2017 №06 (10)

DOI of Article 10.15407/as2017.06.11

2017 №06 (12)

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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: office@paton.kiev.ua
 
 
Abstract
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
 
 
References

1. Stickney, K. (2009) Introduction to geoscart TM and the benefits to refriaeration systems. Greenfield Energy Ltd., 18.
2. Lebedev, V.A., Maksimov, S.Yu., Pichak, V.G. et al. (2014) Automatic machine for wet underwater welding in confined spaces. The Paton Welding J., 9, 39–44. https://doi.org/10.15407/tpwj2014.09.06