Efficient and automatic welding process for rack and semi-chord pipe

The invention relates to a welding process, in particular to an efficient automatic welding process for a rack and a semi-chord tube. The method is suitable for connection between semi-chord plates with different thicknesses and rack plates and specifically comprises the following steps that a narrow groove is designed; after the grooves are grouped, arc striking plates consistent with the grooves in shape are connected to the starting position and the final position of a welding bead; selecting protective gas; whether pre-weld preheating and post-weld heat treatment are carried out or not is determined according to the strength level of the plate; two narrow-gap gas shield welding robots are adopted to work in a matched mode at the same time. Welding process parameters are selected; the interlayer temperature in the welding process is controlled; a laser tracking system is used for monitoring the position of the welding wire; and during double-sided welding, turning-over welding is carried out when welding is carried out for 1-4 passes, or double-sided simultaneous welding is realized by adopting a double-robot welding system. The welding penetration is increased, the welding quality is superior to that of a traditional welding method, the stress of a welding joint is effectively controlled, the product stability is well controlled, the welding efficiency is greatly improved, and the welding cost is greatly reduced.