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Subject: upstream and downstream gen. Здравствуйте,Помогите, пожалуйста перевести: upstream and downstream Контекст:
Руководство по установке системы сгорания, раздел про сварные стыки для сборки Before welding, a visual inspection shall be conducted on the edges in order to ascertain the absence of defects, dirt, grease and/or oil that can compromise the welds.
The pieces to be welded shall be correctly aligned.
In the case of pipe welded lengthwise, coupling shall be done in such a way that the longitudinal welds of the two pipes are diametrically opposite.
The tacks shall be enclosed in the first welding layer; the tack ends upstream and downstream shall first be removed so as to obtain a perfect joining root for continuity of the bead. Заранее большое спасибо
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