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General Discussion
Roll cage design for worst case scenario?
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<blockquote data-quote="Broken Again" data-source="post: 1465199" data-attributes="member: 17015"><p>X2 on the last 2 posts.</p><p>Chromoly can fail if not heat treated. I saw first hand a couple of weeks ago when my friends buggy frame broke in crash. There were 10 or 12 broken TUBES in the heat affected zone next to the welds. Each tube broke about 1/8 to 1/4 inch away from the weld joint. This was a well designed frame....but not heat treated.</p><p>4130 and 4340 will become brittle and are subject to cracking and breaking near the weld...it's all about the Martensite.</p><p></p><p>Looking back at 120 mph rides I took in that buggy sends chills down my spine.</p><p></p><p>Pic of the buggy here, but I don't have any pics of the broken frame.</p><p><a href="http://www.nw-wheelers.com/forum/showthread.php?t=56808&highlight=buggy" target="_blank">http://www.nw-wheelers.com/forum/showthread.php?t=56808&highlight=buggy</a></p><p></p><p></p><p>edit:</p><p><a href="http://www.netwelding.com/Heat_Treated_4130.htm" target="_blank">http://www.netwelding.com/Heat_Treated_4130.htm</a></p></blockquote><p></p>
[QUOTE="Broken Again, post: 1465199, member: 17015"] X2 on the last 2 posts. Chromoly can fail if not heat treated. I saw first hand a couple of weeks ago when my friends buggy frame broke in crash. There were 10 or 12 broken TUBES in the heat affected zone next to the welds. Each tube broke about 1/8 to 1/4 inch away from the weld joint. This was a well designed frame....but not heat treated. 4130 and 4340 will become brittle and are subject to cracking and breaking near the weld...it's all about the Martensite. Looking back at 120 mph rides I took in that buggy sends chills down my spine. Pic of the buggy here, but I don't have any pics of the broken frame. [url]http://www.nw-wheelers.com/forum/showthread.php?t=56808&highlight=buggy[/url] edit: [url]http://www.netwelding.com/Heat_Treated_4130.htm[/url] [/QUOTE]
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Roll cage design for worst case scenario?
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