Abstract
Steel chimney stack shells with thinning caused by local corrosion are repaired using spliced joints. However, if workers do conventional repair welding, back coating film is damaged by heat input and needs repainting which causes increased costs. Therefore it was developed a low heat input welding method protect back coating film from heat damage using high speed robot welding. Because it is not possible to measure the backside temperature directly during welding, the authors developed a system to guarantee backside temperature when using the low heat input welding method. Backside temperature is guaranteed by using surface temperature data obtained from the thermal sensor attached to the torch tip of the welding robot. This method is applied to steel chimney repair welding at thermal power plants.
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