One of the STP enterprises with the most modern equipment is the Welding and Assembly Plant. The welding and assembly workshops of the plant process light and heavy metal structures of various types, sizes and weights on request. Along with this, parts of different sizes and metal structures are assembled in the mechanical assembly zone.

The plant produces trailers and semi-trailers used in various fields of construction and industry and distinguished by the purpose of the HOWO STP brand, as well as bodies for trucks (STAQ – different sizes of 17, 22, 28), crane machines, sandwich panel containers, cars and other products. It also carries out maintenance and repair works.

The Welding and Assembly Plant took part in major construction projects (commissioned by the South Korean Samsung Engineering Co. Ltd. for the Karbamid Plant, commissioned by Ustay Company for the Socar Polimer Plant, vats and platforms of various types for BEC Ltd.).

The enterprise also produces silo vats of various sizes and complexity. On-site installation services are rendered based on the contract concluded with the customer. This plant was also engaged in the production of metal structures for production sites in the STP territory, as well as smelting furnaces for the Aluminum and Copper Profiles Plant.

This enterprise, which also participates in foreign projects, successfully completed the construction of a flag tower with a height of 105 meters at the Zenith Arena in St. Petersburg, commissioned by Gazprom.