Methods and Devices for Automatic Control of Microwelding Joints Quality

摘要

Two original methods and devices for automatic control of joints achieved by spot contact microwelding are offered.rnThe first method is based onto the measurement of final settling value. It was established and verified experimentally, that it could be one of the most acceptable parameter of control at condenser microwelding because settling value well correlates with joint quality and safely (and easily in comparison with electrical parameters, for example) registered at the same time.rnThe second method is based onto the measurement of resistance value between electrodes and evaluation of its modification at three time periods: 1. Initial resistance before the welding current turns on; 2. Resistance at time period between preheating current impulse and welding current impulse; 3. Resistance between electrodes at the end of the process, when welding current turns off. This method and device is especially efficient for condenser microwelding machines, which use two current impulses: preheating and welding, and also allow avoiding initial splatter for wide range of surfaces preparation conditions.rnSo, two different approaches - physical and mechanical parameters measurement and evaluation - are implemented. Offered methods and devices allow achieving high quality microwelding joints and could be recommended for industrial use.