frame stiffeners...anybody heard of these

just buy a sheet of plate and some big sheets of paper and make your own templates... cut your own - Or check around at plasma / laser cutting places you may be able to have the same basic thing made cheaper, with your templates.

worth a shot for over $200
 
JeepAddict85 said:
they look pretty nice, and they extend fully to the front/rear. Probably a bit lighter with all those holes.
Click to expand...

i'm trying not to laugh. the holes are for more welding areas, not to decrease weight. since the majority of the stiffness comes from the outside of the stiffener, taking a hole out of the middle (think like you're taking a hole out of the rib of an i-beam). moment of inertia is proportional to the height^3, so a little out of the middle (which will have a small h) won't matter much. due to the fact that the sheet metal of the unibody is so thin, only a few weld spots would not be adequate for stiffness-matching of the plating to the unibody. once again, think stress distribution. what the hell do you expect. i'm an engineer.

but for real, keep tech in tech. this doesn't belong in this forum.
 
well that is definately something to consider i mean being an engineer you would definatly know more about force tolerances and stuff than me its defenatly something to think about thanks for your input
 
asp387 said:
i'm trying not to laugh. the holes are for more welding areas, not to decrease weight. since the majority of the stiffness comes from the outside of the stiffener, taking a hole out of the middle (think like you're taking a hole out of the rib of an i-beam). moment of inertia is proportional to the height^3, so a little out of the middle (which will have a small h) won't matter much. due to the fact that the sheet metal of the unibody is so thin, only a few weld spots would not be adequate for stiffness-matching of the plating to the unibody. once again, think stress distribution. what the hell do you expect. i'm an engineer.

but for real, keep tech in tech. this doesn't belong in this forum.
Click to expand...


yes i know the holes are for more welding, but they are quite a bit larger than the regular ones you see for plug welding. since they are that much larger, it doesnt seem like it would be necessary to completely fill in the circles with weld. so...less material used...less weight...same amount (relatively speaking) of welds. am i correct in my reasoning Mr engineer?
 
I'm just thinking i'd weld the full circle...and sure it might be a lil lighter but not by much. I'd just do like 10 guage sheet and make my own if it were gonna just be flat small sections like that... I think the bent full length ones seem like a stronger design
 
JeepAddict85 said:
yes i know the holes are for more welding, but they are quite a bit larger than the regular ones you see for plug welding. since they are that much larger, it doesnt seem like it would be necessary to completely fill in the circles with weld. so...less material used...less weight...same amount (relatively speaking) of welds. am i correct in my reasoning Mr engineer?
Click to expand...

not really. you wouldn't want to plug weld them. plug welds are typically used when material thickness is closer to the hole size (like a 1/2" hole in 1/4" plate). these are 10g i think (so figure about .135" thick) and the holes in these look to be around 2" or more. pooping weld to fill a circle will not increase the weld area properly and it would probably distort the crap out of the unibody. i'd do stitch welds around the perimeter of the circle, just like around the outside.
 
asp387 said:
not really. you wouldn't want to plug weld them. plug welds are typically used when material thickness is closer to the hole size (like a 1/2" hole in 1/4" plate). these are 10g i think (so figure about .135" thick) and the holes in these look to be around 2" or more. pooping weld to fill a circle will not increase the weld area properly and it would probably distort the crap out of the unibody. i'd do stitch welds around the perimeter of the circle, just like around the outside.
Click to expand...

isnt that what i just said?

'since they are that much larger, it doesnt seem like it would be necessary to completely fill in the circles with weld'
 
nope, what you said was a plug weld...

what he's describing (I believe) is a rosette weld, or just a lap weld all the way around each hole. You're using the wrong terminology, but then again I probably am too.
 
kastein said:
nope, what you said was a plug weld...

what he's describing (I believe) is a rosette weld, or just a lap weld all the way around each hole. You're using the wrong terminology, but then again I probably am too.
Click to expand...

i said they are similar to plug welds but are much larger.

on another note...is that what a rosette weld is? I figured for the larger holes you would just weld around the perim of the circle, or do a few stitches inside of each.
 
rosette welds and plug welds are the same thing.
 
JeepAddict85 said:
i said they are similar to plug welds but are much larger.

on another note...is that what a rosette weld is? I figured for the larger holes you would just weld around the perim of the circle, or do a few stitches inside of each.
Click to expand...

While I understand that you both are talking about the same thing, I'll say this.

This wouldn't really be similar to a plug weld. You can sort of think of a plug or rosette weld as a screw: you have one material overlapping the other, and want to attach those two materials to each other.

You first create a hole in the top most material, and then proceed to start at the bottom material, and weld the two pieces together, filling in or "plugging" the hole as you go. A plug weld is always done with relatively small sized holes.

This is why Anthony started talking about why you shouldn't plug weld a hole that big. By definition, if you were to plug weld it, you would have to fill that entire hole with weld, which would do nothing for you.
Instead, you would do as you both stated, stitch weld around the perimeter of the hole. This would then just be a stitch weld, regardless of the fact that you are stitch welding a hole.
 
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