Welding SAE 1045 Steel Plates

By jrflores Date 07-14-2005 22:06

We want to weld two 3/4" plates to a central 7/8" plate as if they where plane wings . The fillet length is of 5,1/2" and we are looking for the best procedure.

The three plates are SAE1045

We have taken some info from another topic from Mr. Crisi from Sao Paulo (thanks!) about welding 1045 like preheating to 200 F and wrapping the affected zone with an insulating material to slowly cool.

1. Is there anything else to pay attention to?
2. Do we need to normalize or stress relieve after welding?
3. If the answer to No. 2 is yes, can we avoid this heat treating by using A36 structural steel plates? Or does A36 strucural steel also needs the treatment?

By G.S.Crisi (****)

Date 07-15-2005 12:56

1. SAE 1045 is a medium carbon steel (carbon content 0.45%) and it's not easy to weld. Only a qualified welder should do the job.
The right electrode or wire should be chosen. Maintain the temperature as long as the welding takes place. Do not allow it to cool or cracks will appear. Then, wrap it with an insulating material so it'll cool slowly.
2. It depends on the Code or Standard you're following. If you're following ASME VIII, for example, yes, you need to stress relief the weld.
3. Again, if you're following ASME VIII, yes, A 36 needs to be stress relieved because the thickness is over 3/4 inches.
Giovanni S. Crisi
Sao Paulo - Brazil

By bmaas1

Date 07-15-2005 16:58

I would use ASTM A572 GR 50 instead.

Brian