| abstract |
A high temperature iron-chromium-aluminum (FeCrAl) alloy tube (1) extending along a longitudinal axis (C), the tube being formed from a continuous strip (3) of high temperature FeCrAl alloy and helical With a square weld seam (2). The high temperature FeCrAl alloy tube feeds a continuous strip of high temperature FeCrAl alloy to the tube forming (4) and spirals the strip so that the long ends (6, 7) of the strips abut each other , Forming a rotating tube (1) moving forward in a direction parallel to the longitudinal axis of the tube, and as soon as the tube is formed, by continuously joining the abutting long ends together by welding A welded tube is produced which has a helical weld joint. [Selected figure] Figure 4 |