I am wondering what the applicable ASTM standards are for SAE 1045 Hot Rolled Steel. I am trying to determine preheat requirements for a project that I am working on. We are joining HR 1045 1" thick plate to a 2 to 2-1/4" diameter solid, also HR 1045. The setup is with a hole thru the plate, the bar is inserted perpendicular to the plate, and then fillet welds using MIG welding on one or both sides, depending on the application. The hole on the plate is chamfered, which to me seems unnecessary. I think a proper fillet weld should have enough penetration.
Table 3.2 does not list ASTM A576 for preheat guidelines. This is the applicable standard according to Ryerson-Tull stock list book. From the AWS structural code, using the method outlined in Annex XI3. HAZ Hardness Control, it seems that preheat may not be required with the right amount of energy input. According to the method above, I calculated that a fillet weld of leg size 3/8"-5/8" is possible with MIG process without preheat. Energy input would be 150 kJ/in. I'm assuming this is in the 1F position. I would like to hear if anyone has any evidence or experience that would validate or invalidate these calculations. Also, an equation relating energy input to voltage settings, amperage, travel speed would be awesome. Any help/advice would be greatly appreciated. Thank you
Travis Coolman