which is better 400w or 500w galvanometer laser welding machine

is a 4000w continuous laser welding machine good for spot weldingbuy 3 axis laser welding machine for silicondoes a continuous wave laser welding machine work on siliconpulse laser cleaning machine for cast irondoes a three axis automatic laser welding machine work on carbon steelcan a 600w 3 axis laser welding machine weld stainless steel sheetbest 150w jewelry laser weldercan a fiber laser welding machine be used for microelectronics weldingbest handheld laser rust removal machine for aircraft parts cleaningcan a 500w automatic laser welding machine weld aluminum
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