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Q: Do you have any information the weldability of ASTM A148- 65 (80-50). This material was used in castings for bridge bearings for a bridge constructed in 1967. Our desire is to weld ASTM A572 Grade 50 plates to the ASTM A148-65 (80-50).
A: I checked the ASTM A148 80-50 specification you referenced in your request and found minimal compositional information. The only reference to composition is that the sulfur must be 0.06 percent Max and phosphorus 0.05 percent Max.
There was no reference to ASTM A148-65 within the specification, which was written around steel castings that are subjected to higher mechanical stresses than those covered in ASTM A27. The ASTM A27 specification contains a reference to a grade 65-35 material that essentially is equivalent to a SAE 1030 alloy heat treated to a minimum of 65ksi tensile strength and 35ksi yield strength.
Without clarity as to which specification is applicable, it is difficult to determine actual weldability. However, it could be assumed that...