Resistance welding control systems utilizing secondary current feedback receive widespread utilization both in Europe and Japan. However, these types of control systems are only beginning to be used in any extended basis in this country. Currently, two variants of these systems are available; so called “self-teaching” systems, and “learning curve” systems. Either system has been shown to be capable of providing a stable secondary resistance welding current within two cycles. Recent work has indicated, however, that the self-teaching type control systems may be adversely affected by non-optimum set-up conditions, particularly poor fit-up and the introduction of organics (sealers or adhesives) at the faying surface. This work examines the performance of learning curve type constant current control systems under these adverse set-up conditions. Six conditions were selected for study; three degrees of progressively poorer fit-up, with and without an organic sealer. For each condition, current range curves were generated, and process measurements taken. For all sets of conditions, the learning curve control system performed well. Current range results indicated no premature expulsions associated with controller function, and in fact current range curves for all conditions were quite similar. Process results indicated that in all cases the current waveforms were quite stable. Current, voltage and dynamic resistance waveforms were quite similar for all trials. For the trials without adhesive, the firing angle results indicate that the controller functioned by compensating for variations in dynamic resistance throughout the process. A similar relationship between firing angle and dynamic resistance was not noted for the welds made with sealer.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    EFFECT OF FIT-UP CONDITIONS WHEN USING CONSTANT CURRENT CONTROL SYSTEMS FOR RESISTANCE SPOT WELDING


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Gould, Jerry E. (Autor:in) / Kimchi, Menachem (Autor:in) / Mitchell, Tom (Autor:in)

    Kongress:

    International Congress & Exposition ; 1993



    Erscheinungsdatum :

    01.03.1993




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Effect of fit-up conditions when using constant current control systems for resistance spot welding

    Gould,J.E. / Kimchi,M. / MNitchell,T. et al. | Kraftfahrwesen | 1993


    Intelligent constant current control for resistance spot welding

    El-Banna, M. / Filev, D. / Chinnam, R.B. | Tema Archiv | 2007


    Implications For Aluminum Resistance Spot Welding Using Alternating Current

    Spinella, D. | British Library Conference Proceedings | 1995


    Resistance spot welding using continuous tape

    Trommer, Gerd | Tema Archiv | 2009


    Multi Step Current Controlling Method in Resistance Spot Welding

    Mukumoto, K. / Shinmyo, T. / Kikuchi, R. et al. | British Library Conference Proceedings | 2007