Piston air compressor--6 months for compressor head and motor subject to proper use/maintenance following the operation manual, from the date of shipment.
 

Screw compressor----1year for whole unit compressor, 2 years for screw airend subject to proper use/maintenance following the operation manual, from the date of shipment.

Welding machine---the trouble rate is very low! From 200units, at most you might find 1-2units defective. If this unfortunately happens in warranty time(12months), then we
will send you free new units for replacement....