| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the weld defect in a weld part with one-side welding and to shorten the time from the welding of ring blocks of a furnace body to lift-up by lifting up the furnace body and executing the remained welding in the case the welding height is a specific value or higher to an iron shell plate thickness, at the time of executing welding between the ring blocks in the furnace body in the case of repairing a plast furnace. SOLUTION: A one-side bevel 5 having 30 deg. bevel angle 7 is arranged at the joining parts of the iron shells 1, 2 and backing strips 3, 4 are fitted and welded. When the welding metal 6 becomes a size 9 having >=1/2 of the plate thickness 8 of iron shell, the furnace body is lifted up, and after lifting up, the remained welding is executed. By this method, after pre-fitting an attached device of the ring blocks, the one-side welding can be executed from the outer side of the iron shell and the whole attaching device of a sleeve, etc., can be fitted without needing the work in the furnace and a scaffold in the furnace.</p> |
