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Let's see if I understand:
Your garage is wired with a 240 volts 30 amp circuit
You want to plug a 230volt, 25 amp max device into it
The service receptacle doesn't match the cord end on the device
You are considering making a cord to adapt the device to the wall socket
You should encounter no electrical problems at all.
It would be cheaper to replace the receptacle with one that matches the welder cord because you only have to buy one receptacle. To make an adapter pigtail you'd need the receptacle plus the dryer cord/cord end.
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