2022年7月12日星期二

handbook of induction heating eddy current

PDF handbook of induction heating eddy current

Both induction heating and eddy current testing work with coils, generators, ac-current and ac-voltage, frequencies, field strength and induction law. Contrary to heating of the test parts, the eddy current test does not want to heat the parts at all but wants to examine them for their metallurgical microstructure, thus for their mechanical features like hardness, case depth or alloy. The eddy current test does not provide absolute values (e.g. "56 HRC" or "2.6 mm case depth"). The eddy current test does detect fine differences in micro-structure with high sensitivity. In the production line, within a fraction of a second, a non-destructive 100 % test for hardness case depth hardness run out, hardness pattern tensile strength carbon content soft spots surface decarburisation is completed, and thus quick corrective reactions to any variance from the specified structure can be realized. With a suitable mechanical part handling arrangement, the transport from the hardening station to the test station takes only a few seconds. Faulty parts, caused by a damaged inductor, a jammed quench nozzle or an unknown reason are immediately detected, providing an enormous savings in time and costs! [caption id="attachment_7309" align="alignright" width="1024"] induction-heating-eddy-current.[/caption] Different from the induction heating, the energy for eddy current testing is very small, in the milliwatt range. Field strength is low and permeability is in the range of the initial permeability. Test frequencies ranging from some Hz to some hundreds of kHz provide information on undesired structures via the frequency dependent penetration depth of the eddy current and on the formation of permeability. Very small electrical signals require a very precise evaluation in order to assure their differentiation from ambient interferences. A small drift from variation in temperature and high long term stability are absolutely necessary. Digitization of input voltages immediately at the front end of the electronic evaluation is of huge advantage. Handbook-Induction-Heating-Eddy-Current-Paper-EN

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HLQ induction heating machine manufacturer provides the service of induction brazing,melting,hot forming,hardening surface,annealing,shrink fitting,PWHT,etc.