Through　the　study　of　double　switch　forward　converter,　an　arc　welding　power　circuit　with　LCD　nondissipative　snubber　is　designed　by　using　IGBT　as　its　power　switch.　The　operating　principle　of　this　converter　is　analyzed　in　detail;　the　design　considerations　of　key　circuit　parameters　for　the　topology　are　introduced.　The　LCD　nondissipative　snubber　can　not　only　suppress　the　voltage　spike,　but　also　reduce　switching　loses　and　improve　power　density　and　efficiency.　Furthermore,　the　snubber　itself　is　lossless.　The　paper　provides　the　foundation　of　researching　high　efficiency　power　circuit　based　on　Interleaving　Two-Transistor　converter.　The　experiment　results　of　the　prototype　coincide　with　the　theoretical　analysis　and　the　validity　of　analysis　approach　is　proved.