WELDING AR235 PLATE
WELDING AR235 PLATE
(OP)
I am attempting to construct a liner consisting of AR235 plate to line the the inside of a trommel conveyor that my company is building. For those that don't know a trommel conveyor is basically a large steel cylinder that is used to sort materials. The trommel is mounted on an incline and rotated and the material passing through is separated through holes of varying size. Our trommel is about 7 ft in diameter and 40 ft long and is used to sort scrap metal (mainly shredded cars). Anyway back to my question. I need to weld a large cylinder of 3/8" AR235 plate to the inside of the infeed section of my trommel which is A36 steel. I plan on MIG welding this construction and would like to know what type of wire/gas combination is recommended? The welds in this construction will be subjected to both impact and wear from the loading of the materials. Any help would be appreciated.
Thanks
Thanks





RE: WELDING AR235 PLATE
For the stated base metal thicknesses, I would use a 200 deg F preheat.
RE: WELDING AR235 PLATE
You really have several options with regards to filler metal though. Carbon steel, as metengr mentioned, will have good impact toughness, but will not be that hard. Austinitic stainless such as ER309L will be even tougher, and a little softer, but tends to work harden, and will not contribute to hydogen cracking as carbon steel welding will in the right circumstances. Nickel based fillers such as ERNiCr-3 will also work well, but are expensive. They will be both hard and tough compared to the other options, and will not contribute to hydrogen cracking either. The stainless wire can be run on 98%AR/2%O2 or 95%Ar/5%CO2 since you aren't really worried about carbon pickup, and the Nickel typically uses 100% Ar, or Ar with He mixed in if a hotter arc is desired.
RE: WELDING AR235 PLATE
The bottom line is to go with a more conservative spray-arc transfer mode as Groberts mentions.
The AR235 is a lower end abrasion resistant plate that is really a 0.45% carbon steel with no special heat treatment requirements. The only specification is a surface hardness of 235 BHN. Regarding filler metals, I looked at similar options and given the use of a lower end abrasion resistant plate, for the cost and application, it seemed like carbon steel filler metal was the better alternative.
RE: WELDING AR235 PLATE