The object of research - the technology of welding of the element of power hydraulics - a shut-off valve. The purpose of the study is to develop welding technology for a wide range of element shut-off valve under the condition of ensuring the formation of a circular weld of specified geometry with the minimum possible welding deformations and standard coaxiality after welding. Methods and approaches used - to achieve the result is based on a review of existing literature and analysis of Technological approaches which allow ensuring minimal welding deformations under the condition of standard parts coaxiality and formation of a seam of a given geometry with absence of damage to the surface of the parts are considered. The main methods used in this work are welding in the "boat" position, pulsed arc welding with a periodic change in the welding current and a controlled change in welding modes along the circular weld, dividing its length into sectors to compensate for welding deformations and obtain standard parts coaxiality. Main results are shown as recommendations given to make clear how to use technological methods that ensure the production of a standard welded joint of a shut-off valve made of structural stainless steel of the austenitic class of type 03X17H14M3. It is given an example of dividing the length of an circular movable fillet joint into sections (sectors), and shown as an application of one of the technological methods used in the present study to obtain a standard welded joint. The study shows that using the arc welding in gases with a non-consumable electrode using the technological approaches described in this paper made it possible to solve the problem of forming a circular movable fillet joint under the condition of a given geometry of weld shape (± 0.2 mm with a normalized leg) and ensuring minimal welding deformations under the condition of standard parts coaxiality less than 0.2 mm with absence of damage to the surface of the parts.