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★ Preheating working

1) We should preheat not only bevel the inside but also both side of bevel 50∼100mm. Especially if is windy, a counterplot for protection against wind

In preheating, we judge that preheating temperature is proper with checking temperature chalk is melted. And it is better to do welding immediately. In case of temperature is low, scrupulous care is required because it is necessary to preheat base metal during welding.

2) Check point of preheating

① Existence write or not of preheating temperature and execution process in report for manufacture way.

② Check or not necessary preheating temperature according to quality of materials and thickness

③ Check or not a record of the air temperature.

④ Check or not the preheating range.

⑤ Record about preheating temperature of each parts.