Control of forming process of truss structure based on cold metal transition technology

Abstract

Purpose The purpose of this paper is to study the wire and arc additive manufacturing (WAAM) method and path planning algorithm of truss structure parts, to realize the collision-free rapid prototyping of truss structures with complex characteristics. Design/methodology/approach First, a point-by-point stacking strategy is proposed based on the spot-welding mode of cold metal transfer welding technology. A force analysis model of the droplet is established, which can be used to adjust the posture of the welding torch and solve the collapse problem in the WAAM process of the truss structure. The collision detection model is developed to calculate the interference size between the truss structure and the welding torch, which is used to control the offset of the welding torch. Finally, the ant colony algorithm has been used to optimize the moving path of welding torch between truss with considering the algorithm efficiency and collision avoiding and the efficiency of the algorithm is improved by discretizing the three-dimensional workspace. Findings A series of experiments were conducted to prove the validity of the proposed methods. The results show that the wire feeding speed, welding speed are the important parameters for controlling the WAAM process of truss parts. The inclination angle of the welding torch has an important influence on the forming quality of the truss. Originality/value The force analysis model of truss structure in the WAAM process is established to ensure the forming quality and a collision-free path planning algorithm is proposed to improve forming efficiency.

A Review of the Development Status of Wire Arc Additive Manufacturing Technology

“…Its path planning method and actual additive situation are shown in Figure 30. Wang et al [44] proposed a point-by-point surfacing strategy. A droplet force analysis model is established, the welding torch posture is adjusted, and the collapse problem during the WAAM process of the truss structure is solved.…”

Optimization Design of Bridge Inspection Vehicle Boom Structure Based on Improved Genetic Algorithm

“…As an important part of transport infrastructure, bridges play an irreplaceable role in maintaining traffic safety and ensuring economic development [10][11][12]. Periodic inspection and maintenance are essential during the operation of bridges [11][12][13]. As the main equipment for bridge inspection, the design and optimization of the bridge inspection vehicle arm directly affect the effectiveness and efficiency of bridge inspection [14][15][16].…”