I have a Mk1 rear quarterlight frame that has a split/crack on each side of the frame where it rises to meet the lower edge of the piano hinge
A mate has had a go at TIG welding it.
Its unmarked ie no sign of rust and a magnet doesn't touch it so I made the assumption that it is stainless.
However when he TIGS it as it heats up it turns blue and spits back.
My question is : Is it made from a different material other than stainless or is it stainless with a chrome coating? It may possibly be a 59/60 frame (which had a different catch on it) but usually MK1 frames have pitted or fallen apart by now so this has me flummoxed.
Cheers. Mark
Mk1 Window frames repair
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Catmint
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Re: Mk1 Window frames repair
It's brass - when you try and TIG brass it burns the zinc content off which causes the spitting
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rolesyboy
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Re: Mk1 Window frames repair
No way Gordon 
. I never thought they were made of brass. Thanks for sharing.
Were some made of brass and others of something else?? Usually Mk1 frames go all black and pitted like Mazak
. I never thought they were made of brass. Thanks for sharing.Were some made of brass and others of something else?? Usually Mk1 frames go all black and pitted like Mazak
Rolesyboy
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Re: Mk1 Window frames repair
You can get stainless ones, but not sure what they were fitted to - may have been european builds. Doc used them in his broadspeed build
Mazak is a zinc alloy, brass is an alloy of copper with 33% zinc.
Had a chat with about chrome plating with my pet plater - one of his comments was that chrome will (slowly) react with copper and zinc which is why it pits over a period of time. Nickel is a better base layer. The reason why copper is used as a base layer is that it is cheaper and you can quickly build up a thick layer to hide imperfections
Mazak is a zinc alloy, brass is an alloy of copper with 33% zinc.
Had a chat with about chrome plating with my pet plater - one of his comments was that chrome will (slowly) react with copper and zinc which is why it pits over a period of time. Nickel is a better base layer. The reason why copper is used as a base layer is that it is cheaper and you can quickly build up a thick layer to hide imperfections