This specification includes carbon and low-alloy
steel filler metal used for oxyfuel- gas welding (OFW). The letter “R” in the
designation stands for rod. Filler metal made to the requirements of this
specification is supplied in the bare wire form and usually in cut straight
lengths. Number designations following the letter “R” represent the minimum tensile
strength in KSI (i.e., 1,000 psi). Although OFW was one of the first welding
processes used for joining metals, OFW has limited usage in the manufacture of
pressure vessels to the B&PV Code.
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