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<blockquote data-quote="PaulR" data-source="post: 737096" data-attributes="member: 176256">I woudn't put a flame near either steel or ally.In order to get steel to a state where it can be easily manipulated we're talking red hot.&nbsp; At this temperature you'd end up with a lot more distortion, because of the expansion across the dish petals, than you started with.&nbsp; The expansion would also radiate out from where you're applying the heat so could end with a bulge just where you don't want it.Ally would be worse.&nbsp; There's no helpful red glow.&nbsp; If you don't get the temperature just right it'll melt and slump before your very eyes.&nbsp; When I was taught ally welding and brazing years ago there was a trick to assess the temperature involving drawing across the surface of the ally with a dead match.&nbsp; Until it gets to the right temperature you get a black charcoal line left behind.&nbsp; When it reaches the right temperature the carbon oxidises away and there's no line left.&nbsp; It's a very fine distinction after that before it melts away.</blockquote>

[QUOTE="PaulR, post: 737096, member: 176256"] I woudn't put a flame near either steel or ally. In order to get steel to a state where it can be easily manipulated we're talking red hot. At this temperature you'd end up with a lot more distortion, because of the expansion across the dish petals, than you started with. The expansion would also radiate out from where you're applying the heat so could end with a bulge just where you don't want it. Ally would be worse. There's no helpful red glow. If you don't get the temperature just right it'll melt and slump before your very eyes. When I was taught ally welding and brazing years ago there was a trick to assess the temperature involving drawing across the surface of the ally with a dead match. Until it gets to the right temperature you get a black charcoal line left behind. When it reaches the right temperature the carbon oxidises away and there's no line left. It's a very fine distinction after that before it melts away. [/QUOTE]

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