Electrolytic Nickel Plate Adaptive Spot Welding Controller Developed Its Process

The resistance spot welding is one kind production of more efficiency, simple operates and easy to realizing the automation, So It is extensive used by industry production. With automation level increasingly rising, More and more ask using the accurate method to come to test to weld course and quality that to raise the reliability of connects. In real production, the welding quality will be influenced by these unavoidable factors, such as different material, the workpiece thickness, the change of spot welding resistance, separate current and electrode wear etc. In order to pledge the consistent of welding quality, compensate to the mentioned above various factor . The high accuracy controller with AT89C51's onboard computer can self-adaption the welding standard along with the thick s of board has been developed in this paper .Nickel and the nickel alloy is important material that used in the petroleum chemical industry, aviation, aerospace , and nuclear energy industry. The at present process method of pure nickel is forming the electric conduction return circuit in the electrolysis pond by way of thin electrolysis nickel board (the beginning board) and solderless joint the beginning board ,and makes the thin board continue deposit to achieve the requirement appointed to accomplish . But his the solderless joint method one-tenth by way of the press riveting leading to the shortcomings such as worker's labor intensity is big and the noise is big etc, and particularly links not firmly and it is high to shed the board rate, and substrate and hangs the nickel board that the ear all moistens for having a large number of electrolysis just owing to begins can not pledge the reliable conductive return circuit , the problem that the urgent need that is in the real production is solved .After going deep into research to the above problem, using resistance spot welding to realize nickel board and the string connection of board, and possess operating simply and reduces the merits such as labor intensity and effective guaranty electrolytic conduction return circuit etc. Therefore this subject is in order to develop electrolysis nickel board multi-functional of microcomputer spot welding controller.The design possesses the control system hardware circuit of anti-jamming ability, to guarantee and the systems have ability of online sampling, calculation and control etc. The circuit including the main welding circuit, shows the interface, watch dog circuit, sampling circuit, trigger, synchronous circuit and electromagnetism gas valve etc.The software system of controller can be divided into work programs and Setting program, work programs include welding course, and welds parameter modification and thick demarcations. Setting program has the ratio modification of transformer, and the modification of internal gain, gathering minimal phase shift and the biggest welding three parts. In the welding course can realize constant current supply and permanent percentage and controls and line voltage compensation etc.In pressure stage the controller can looking for the most excellent welding parameter by measurement workpiece thickness. Choose three kinds of optimum technology parameters of board thickness (lmm, 2mm and 4mm) spot welding by way of the diagonal intersection law. It is back with the parametric curve fit at the same...