[QUOTE=Eric Grims;23755]....... but my understanding is that when twist barrels start to oxidize that is when the mental could begin to separate from the flux which is essentially a porcelain and the barrel can blow......QUOTE]
First, the steel and iron ribbons are not soldered together. They are hammer forged. There is no flux, just metal heated red hot and forged together. And when gun metal parts, such as barrel ribs, are soldered to the barrels, its a silver solder. Porcelain has nothing to do with guns, porcelain is a hydrous aluminum silicate clay mineral ( kaolin) which has no tensile strength and is not used in guns.
The exterior barrel finish on composite barrels, such as twist, is differential oxidation that has been initially stabilized. As the barrels age, the external oxidation can increase such that the light steel ribbons and the dark iron ribbons become indistinguishable, and the barrels need refinishing. Brad Bachelder in Grand Rapids and Dale Edmonds in Kansas City do a healthy business in refinishing composite barrels, and take dents out as part of the refinishing. Their work has been shown in photos on this forum many , many times.
I don't know much about Syracuse twist barrels, but twist barrels were made in England and Belgium and sold to the trade. These were high quality and its probable Parker and Syracuse bought their barrels from the same source. Many, many Parker twist barreled guns have been refinished, de-dented, and are in frequent use. From what I've seen, and I've seen dozens of them, they are no more subject to cracks at dents than are fluid steel barrels. And then I've seen cracks welded and shot.
Perhaps the person who told you about porcelain and flux in hammer forged composite barrels had his mental separate.
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