The purpose of the article is to study the influence of cracks on the stress concentration in butt-welding
and corner-welding joints.
The measures were called for by the Defence Committee of the Steel Butt-Welding
Fittings Industry of the European Union.
Introducing a butt-welding
system with capability for vertical (i.e., right-angled or corner) welding of PE, PP, PVC, and other sheet products to make shaped products like tanks.
The centre-piece of the investment is a butt-welding
machine capable of manufacturing HDPE and HPPE fittings from 355 - 630mm in diameter, complementing Plasflow's existing capabilities.
A fully automatic system for thermally butt-welding
all four corners of a PVC window frame simultaneously was shown by Technoplast International, Corrales, N.M.