6013 or 7018

[BrokenBiker]

I'll be making a toe jack adapter for my 20t bottle jack Saturday when I'm home.

Pretty basic design, 10mm thick baseplate, a length of 50x50x5 box welded to that, a bit of 60x60x5 box to slide over the 50mm, then a 60x60x6 angle iron foot welded to the bottom of the 60x60 box, and the same welded at the top on the back side for the jack to act on, maybe some gussets as well that will be 5mm thick

Simple design that will be prepped to give full penetration on all welds, the 50mm box will be bevelled half its wall thickness and a 1.6mm root gap on a bit of tig rod to help with getting everything square as well as get full penetration and probably tacked with the gasless mig flat out purely for ease but i dont want to use the gasless to weld it fully as im more confident with a stick welder for this sort of stuff, the mig can be deceiving if you arent spot on with it ...I know enough about lifting and use these style Jack's enough to know I'm well over the specs needed for the max 2 ton I'll likely ever lift (closer to 500kg actual lifting) but, that said, would you use a 3.2 6013 or a 7018? I've an inverter that will happily run a 7018 all day long, just don't have the rods (yet) but can order them to arrive sat morning, but i have 2.5 and 3.2 6013s already

 

[chrismac]

6013s will be fine, biggest issue is keeping the slag traps out them, 7018s are hassle free,

 

[BrokenBiker]

6013s will be fine, biggest issue is keeping the slag traps out them, 7018s are hassle free,

I can run 6013s to a good enough standard to not get many inclusions, I find they generally only happen if I'm running a bit cold or I don't grind my stop/starts out properly...I am a hot and heavy type of welder, so usually run 10-15 amps higher than recommended which seems to help. I'm also not worried about grinding a section out to re-do as its only a project for myself.

Won't bother ordering the 7018s then

 

[Erie Fred]

Have you run 7018 much ?

 

[BrokenBiker]

Have you run 7018 much ?

Not recently, run them a fair few years ago when I had a dedicated mma inverter, but when that went I got a small buzz box that didn't have the ocv for them, my tig Inverter will run them now although I haven't tried any yet

 

[Erie Fred]

Not recently, run them a fair few years ago when I had a dedicated mma inverter, but when that went I got a small buzz box that didn't have the ocv for them, my tig Inverter will run them now although I haven't tried any yet

I would get a small box of them, just enough for this job +10% (they don't like being stored in humid conditions)
Try them on this job, I think you will like the way they run over the 6013.

 

[BrokenBiker]

I would get a small box of them, just enough for this job +10% (they don't like being stored in humid conditions)
Try them on this job, I think you will like the way they run over the 6013.

How they run isn't really the issue i want to solve, just want to make sure i have enough strength in the parts to withstand the forces involved. Like I said I've run 7018 before as well as 7024 and 6010/11 on someone else's machine as I've never had anything that will run 6010.

 

[Pigeon_Droppings2]

How they run isn't really the issue i want to solve, just want to make sure i have enough strength in the parts to withstand the forces involved

IF you're anything like me you'll research to the nth degree and then over engineer it to the point where it could support a tank being driven by an elephant .

I seem to recall (maybe I read somewhere) that 1 inch of (proper) weld can support something like 1 ton of weight. I'm sure someone on here will know and confirm or correct...it's the sort of rough rule of thumb that I use (then double it for safety...then double again just to be sure!).

 

[BrokenBiker]

IF you're anything like me you'll research to the nth degree and then over engineer it to the point where it could support a tank being driven by an elephant .

I seem to recall (maybe I read somewhere) that 1 inch of (proper) weld can support something like 1 ton of weight. I'm sure someone on here will know and confirm or correct...it's the sort of rough rule of thumb that I use (then double it for safety...then double again just to be sure!).

I just picked 5mm wall box section because the 60mm slides over the 50mm box and its virtually guranteed to be more than strong enough and as that was 5mm thick I doubled it for the baseplate and the angle is only 6mm thick because I couldn't get 5mm.

The 50mm box will be bevelled and fully welded, the foot and head pieces will be welded on 4 sides hot with a 3.2mm rod so plenty of penetration there as well

 

[oilcooled :)]

6013 fine general purpose rod

 

[Erie Fred]

How they run isn't really the issue i want to solve, just want to make sure i have enough strength in the parts to withstand the forces involved. Like I said I've run 7018 before as well as 7024 and 6010/11 on someone else's machine as I've never had anything that will run 6010.

You indicated leaving some slag deposits when using 6013, hence my suggestion.

 

[BrokenBiker]

You indicated leaving some slag deposits when using 6013, hence my suggestion.

I meant I don't have any real issues with slag inclusions unless running cold or not prepping properly...

 

[Erie Fred]

I meant I don't have any real issues with slag inclusions unless running cold or not prepping properly...

Whatever......

 

[Porkypine]

I've used 6013 for just about everything for donkey's years, perfectly good for most practical purposes.

 

[BrokenBiker]

I've used 6013 for just about everything for donkey's years, perfectly good for most practical purposes.

I will use the 3.2's I already have. I used to use 6013 for pretty much everything when I only had a stick welder for bigger stuff

 

[anto44]

The tensile strength of a 6013 weld is 60,000psi and 7018 is 70,000psi. I'd design it so it's over engineered to the point where there's enough good welds on it that the strength of either rod is overkill and use whatever rod you have available to you.