Truss refers to a grid structure composed of members connected at two ends, and tube truss refers to that all members in the structure are circular tube members. In most cases, the members in the truss only bear axial tension or pressure, and the stress is evenly distributed on the section, which is easy to play the role of material. These characteristics make the truss structure save materials and light in weight. It is easy to form various shapes to adapt to different uses, such as simply supported trusses, arches, frames, towers, etc., so truss structures have been widely used in many large-span venue buildings, such as conference centers, gymnasiums and other large public buildings.

In most truss structures, members are connected by welding at nodes. Before welding, the web and chord should be cut in advance according to the weld shape of each member to be welded, which requires intersecting wire cutting at the end of the web and grooving the chord. Because the members of truss structure intersect at the intersection line, and the section shape of the end of the member is complex, two methods, mechanical automatic cutting and manual cutting, are generally used in actual cutting.