Análisis de la resistencia de piezas soldadas por el proceso de resistencia eléctrica

A stay has been carried out in a metalworking company located in the Valle de Aguascalientes Industrial Park, in order to carry out a study that can reflect the state of manufacture of various metal parts that involve an electrical resistance welding process. The manufacturing area is called Automotive and has 5 welding machines of various brands and capacities in which different models of automotive parts are manufactured for various clients of the automotive industry in Aguascalientes Mexico. The study focuses on the review of the process based on the regulations that are handled in the company and that are the JIS B 1196 referring to spot welding, from which two main characteristics are extracted to guarantee the quality of the product and that are the resistance to weld stress and torsional strength. The manufacturing standards used determine that every hour a stress test must be carried out on the different manufactured parts according to their classification, welding is tested on 6M, 8M and 10M nuts of the international system applying loads in a brand FORSE DX-2.5 model hydraulic press and one hundred percent tests torque on parts with 6M nuts welded, which are tested in a devise of our own design. The data taken for the evaluation were obtained in the company's metrology laboratory and showed a very marked dispersion, although said data apparently did not exceed the established limits. A review and evaluation of the process was carried out and limits and improvements were proposed that guarantee good quality of the products. Some practices that can affect quality were found, they are described and a solution is proposed to prevent them from being carried out in the process.