Years and years ago, in your grandads case, 40-60 years ago probably, welders were ten a penny due to all the manufacturing still being done in the UK and lack of automation and robotic welders. Not so much now but yes, good welders can earn a lot these days.It is because trades people did used to get paid poorly.
My mum's dad was an accomplished welder but they still lived on a council estate and were fairly poor as he didn't earn much.
Nowadays he'd probably be very wealthy.
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