... tube 1.9*6.9mm 3.pure Alu made ,welding round ring 4.lead free solder ,air conditioner Informations of ... solder wire, in addition to the corresponding alloy welding performance and physical properties, solder wire also has ... mobility, speed on the tin.Lower flux when welding spatter rate.Flux distribution, good continuity.Minimal smoke and ... suitabe for use aluminum composition tube welded round ring