what wattage metal laser welding machine do i need for dissimilar metal welding

is a 3000w laser welding system good for hermetic sealingcan a 500w jewelry laser welding machine weld copperbest laser welding machine for sale in uaeis laser welding equipment good for railway weldingis a 200w mould laser welding machine enough for welding copper2000 watt continuous laser welding machine for titaniumis a 500w jewelry laser welding machine enough for welding gold alloycan a mould repair laser welding machine be used for stamping die repairhandheld laser welder 1500 wattportable handheld laser welder 1.5kw
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