Abstract: At about 9:30 a.m. on June 11, 1994, Employee #1, of Alhambra Foundry Co., was welding one of the tracks of an overhead traveling hoist, capacity 10 tons, inside the foundry. He was on the twenty-second floor deck of the foundry shop, welding with only the facial screen of a hard hat. The hoist suddenly moved, passing through its track. Due to noise in the foundry, Employee #1 didn't know that the hoist was moving, and was struck on the left side of his head by a traversing boom. Suffering a head and ear laceration, Employee #1 was hospitalized. His supervisor was in his office when the accident occurred, but there were a few other coworkers on the ground floor of the foundry shop engaged in a hoisting operation. They were not aware of the welding work Employee #1 was doing.