gbkim wrote:
Hi John,
I know it's been awhile since you fixed you frame.
I had a question about the steel used for the sister plates, gussets.
Do you buy the same 70ksi rated steel to match up with the frame's steel as well as the 7018C welding rod?
I often read where a steel reinforcement is welded on, but no mention about the type of steel.
Hi Gene,
On all the steel, I started hunting for A529-50 which is high strength low carbon steel which is 50ksi yield and 70-100ksi tensile. A529 I could not get short of a mill run.
I ordered A572-50 which is very similar. The mill supply house ended up substituting ASTM A1011-50 to fill the order. Which is very close as well. The mill certs on what I have tested out as 62ksi yield and 74.2ksi tensile. I bought a sheet 5 x 10ft and had it sheared, rolled to straighten and formed to what I wanted on the splice plates. The flat strips came out well with the rolled straightening.
I needed the 50ksi steel to get the strength I wanted in a thinner plate. Using 36ksi steel would of been too thick and the weight would of gone way up.
Welding, I use E7018AC for the uphill welding. It layed down smooth as expected. I had a limited amount of those rods as I did not have a way to pre condtion them at the temps needed. And buying a treating oven for this small job wasn't justified. I used E7014 which does not need the preconditioning on everything else.
Thanks
John
