Stay out of high-moment areas or extend reinforcement to a lower-moment area.“If you're in a situation where you're putting an inside reinforcement on and an outside reinforcement on, stop them in different places. Sometimes you get away without it.” The Seven Commandments Sometimes you have to take off crossmembers and shorten them. Any kind of tapering you can put on is good.
“You want to spread the stress out as much as you can. So for a 9" frame, you go 18" each way and taper from there. He said the general rule is that reinforcements should taper a minimum of two times the frame height - which fits into Volvo's recommendation of 20-30 degrees, 20 being 2.7 times the frame height and 30 being 1.7 times the frame height. That's why it doesn't matter what kind of butt joint you put in.” The weld we put on the bottom rail is going to fail first. “The bottom rail is in tension,” said Toner, who gives one-day seminars on frames for the NTEA.
He said if the frame is not properly reinforced, it doesn't matter which type of splice is used because the joint on the bottom of the frame will fail from fatigue. When the votes were in, he let everyone in on a secret: There is no correct answer. Which frame splice is the strongest: Straight butt joint? Staggered butt joint? Or tapered butt joint? AT one point during his “Truck Frame Overview For Body Mounting” session, Dick Toner asked for a show of hands.
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