This　paper　presents　an　integrated　simulation　model　for　full　digital　controlled　PMIG/MAG　welding　system　with　Matlab/Simulink,　and　it　consists　of　power　inverter,　digital　control　system　and　dynamic　arc-load　model.　An　integrated　simulation　study　was　done　for　full　digital　PMIG/MAG　welding,　and　a　method　of　connecting　dynamic　arc-load　model　to　the　system　with　controlled　current　source　was　presented;　in　addition,　the　simulation　results　were　utilized　to　study　the　issues　of　digital　control　PMIG/MAG　welding.　The　experimental　results　validate　the　developed　simulation　model,　and　this　simulation　study　can　be　applied　in　implementation　of　the　full　digital　PMIG/MAG　welding　and　analysis　of　system　dynamic　process.