Removal of Out-of-Plane Distortion in Mild Steel Panels Using Flame Heating. Volume 1
1987
Janca, Larry L.
The nature of distortion, the effects of welding, methods of removing distortion, and previous investigations on removing distortion in welded metal structures were discussed. A procedure for linear flame straightening panel structures, used aboard U.S. Naval ships, and the selection of parameters was then presented. The only variable during line heating was the heating flame velocity. 'T' shaped unrestrained mile steel specimen, 1/8' and 3/16' thick, were fillet welded and then line heated to provide an angular distortion vs velocity relationship. Two panel structures (one using 1/8' plate, the other using 3/6' plate) similar to ship deck plates were fabricated and then line heated using the method and relationship determined from the 'T' shaped specimen. The results of testing were presented in the form of distortion tables and graphs. It was found that line heating along the back side of fillet welded stiffeners was an effective way of removing out-of-plane and angular distortion. If the flame velocity was too low while flame straightening one panel, then the adjacent panels were also affected. Also, line heating parallel to the stiffeners did not remove buckling distortion. This study represents a first step in the investigation of flame straightening multi-panelled metal structures. Recommendations for additional testing using a combination of flame heating types, to remove all forms of panel structure distortions were presented.
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