Butt-welding furnaces

Butt-welding furnaces that use type E convex tile radiation burners instead of impingement are controlled by eye measurement of strip temperature. With impingement heating (type H burners), control is by observing the width of strip edge burning, a much more accurate way. 

Furnace butt weld, continuous Straight As required by listed specifications 0.60... 

Intermediate grades are available in API 5L. Furnace butt welds are prohibited. 

Induction welded long seam pipe (similar to ERW) is normally used for 2 to 4 in. (50 to 100 mm) pipe. Continuous (furnace) butt weld pipe is available in V to 4Vfe in. (20 to 115 mm) pipe however, it is never used in critical applications because of its very low reliability. 

United Kingdom o CO CO CQ BW 22 Not specified Continuous furnace butt weld Not required... 

U.S.A. 4.+ 1-3 0 < Butt weld Open he.arth, electric furnace or oxygen converter Cl, 1 Continuous furnace butt weld. Not required... 

Clark [28] for A 533 Gr B Cll carbon steel plate 15 cm thick containing a butt weld. After welding, the plate was given a PWHT at 620 °C for 40 h, followed by furnace cooling. Therefore, it must be assumed that the HAZ properties were restored and residual stresses removed almost entirely. In fact, it can be seen how the FCGR in base metal and HAZ are much the same. The weld metal, instead, behaves much better. FCGR obtained with CT specimens 2 inches (2T-CT) and... 

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