1966年，北京金属构造厂开辟出了使被焊球体扭转的埋弧主动焊。
In 1966, Beijing metal structure factory developed by rotating sphere of the submerged arc welding automatic welding.
硬壳式构造一种金属构造，如飞机，其外壳承担机身受到的全部或大部分压力。
A metal structure, such as an aircraft, in which the skin absorbs all or most of the stresses to which the body is subjected.
适用范围：建筑、造船、飞机、火车、管道工程、厨具、电梯、金属构造工程、装饰金属制造等等。
Applicable scope: building, ships, planes, trains, pipeline engineering, kitchen utensils, elevator, metal construction engineering, ornamental metal manufacturing, etc.
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