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More likely the rounding was to reduce the potential impact damage from them say hitting their head or other parts, as a sharp edge would cause.

Rob.

Thanks all for your assistance, the feedback from each of you is equally valuable in different ways, as it has broadened my information resources enormously. I have been stick welding for 50 years,...

Thanks again Graeme. Good to hear that I have some support for my respone to them.

Rob P.

Thanks Boilermaker. I have never welded Ali, but I saw a training session somewhere that said AC was best for Ali as it gave medium penetration, but that it could be done with DC with the polarity...

I have a CIG 170 inverter welder and am very happy with it for most general work, but an organisation for which I do volunteer work have asked me to recommend what is the best welder for their needs....