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General Discussion
DOM vs. Moly
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<blockquote data-quote="TigTorch" data-source="post: 1211673" data-attributes="member: 17432"><p>The roll cage benefit of DOM or 4130 is not about the alloy. The benefit is in how both tubes are rolled at the mill. In either case the tubes are are extruded to a greater degree and at higher temperature. This produces a very <u>fine grained </u>piece of tubing. The fine grain makes the tube extreemly tough and crack resistant. It is more dificult to kink and collapse these tubes than a hot rolled electric welded tube.</p><p> </p><p>If you ever get the chance, throw a similar sized piece of either in the press, the vise and work it over with a hammer. You'll become a believer.</p><p> </p><p>Regarding the concern over post weld annealing 4130. Some years ago I sent away to the American Welding Society for a pamphlet they published on welding this alloy. What the AWS said is that the alloy will cool to the normalized condition and no weldment annealing is required unless: the material is 2" thick or greater or the material is below freezing temperature when its welded.</p></blockquote><p></p>
[QUOTE="TigTorch, post: 1211673, member: 17432"] The roll cage benefit of DOM or 4130 is not about the alloy. The benefit is in how both tubes are rolled at the mill. In either case the tubes are are extruded to a greater degree and at higher temperature. This produces a very [U]fine grained [/U]piece of tubing. The fine grain makes the tube extreemly tough and crack resistant. It is more dificult to kink and collapse these tubes than a hot rolled electric welded tube. If you ever get the chance, throw a similar sized piece of either in the press, the vise and work it over with a hammer. You'll become a believer. Regarding the concern over post weld annealing 4130. Some years ago I sent away to the American Welding Society for a pamphlet they published on welding this alloy. What the AWS said is that the alloy will cool to the normalized condition and no weldment annealing is required unless: the material is 2" thick or greater or the material is below freezing temperature when its welded. [/QUOTE]
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DOM vs. Moly
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