1. b SUBMERGED ARC WELDING procedure maro place unsafe late madan minme sakit placed on a beach may cause b malon from sakit over local area employees stand in danger.
1. Wait, step beam SUBMERGED ARC WELDING place is not secure end beam on the one place on the กิ๊ด may be losing, กิ๊ด beam fell from his hind legs, the staff is dangerous work area.