worker; metal; sparks; steel; angle grinder; factory; equipment; welding; machine; industrial; manufacturing; production; tool; power; manufacture; iron; work; technology; construction; grinding; metalwork; process; metalworking; blacksmith; spark; grinder; processing; gloves; wheel; technical; labor; craftsman; industry; engineering; welder; machining工人金属火花；钢角磨机；工厂设备焊接；机器工业的制造业生产工具权力制造铁工作技术建设研磨；金属制品；过程金属加工；铁匠火花研磨机；处理；手套轮技术的劳动工匠工业工程焊接工；机械加工
