The Mathematical Model of Welding Process Comparative Study of Identification Method

Abstract:

The dynamic process of the weld pool is a high complex object with strong nonlinearity, mult-variable coupling and a mount of stochastic and uncertain factors. It is very difficult to obtain an analysis mathematic model of weld pool dynamics. Pulsed Gas Tungsten Arc Welding (GTAW) is an important metal’s welding technology, which has been widely applied in the aerospace and manufacturing areas. Therefore, the dynamic characteristic of the welding process has always been hot and difficult in the field of academic research and engineering applications. In order to solve the difficulties of modeling and controlling of nonlinear system, this paper investigates the dynamic characters of the pulsed GTAW from the classic control systems. It obtains the SISO transfer function model by the area method and least square method. The results of simulation experiment show that the area method is better between the two methods.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 2241-2244
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.2241
• Online since: February 2012
• Authors: Jun Feng Wu, Jing Huang
• Keywords: Area Method, Identification Model, Least-Square Method (LSM), Pulsed GTAW

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