SSC - SSTD-8070-0019-WELD REV A
Welding Procedure for ASTM A514 (B) HSLA (T-1 Steel) Plated Pipe - Maximum 2-Inch Material Thickness
|Publication Date:||30 January 2015|
This standard provides for a qualified American Society of Mechanical Engineers (ASME) weld procedure for Gas Tungsten Arc Welding (GTAW) of ASTM A514 Grade B (UNS No. K11630) high-strength (tensile strength of 110,000 psi or more) steel plate (also known as T-1 steel) up to a maximum thickness of 2 inches. This standard provides a weld procedure for performing maintenance and modifications to existing piping systems onsite. This standard is not for new construction unless prior approval is obtained from NASA Engineering.
T-1 metal pipe has previously been identified in John C. Stennis Space Center (SSC) standards (SSTDs) as HSLA, HS-1A, ASTM A514, ASME SA517, ASTM A333, Low Alloy Steel Plate, ASME SA-6 as well as T-1. Some of these references are general in nature and others appear to be incorrect (e.g., A333 Grade 1 has a tensile strength of 55,000 which would not be considered T-1 steel). Prior uses of the ASTM designations are questionable; A514 and A517 are specifications for plate, not pipe.
There are still piping systems onsite that have been fabricated per the requirements of the SSTDs noted below, and therefore must be maintained. Pipe fabricated from T-1 steel is no longer available at reasonable costs or delivery. Therefore, this procedure uses A514 Grade B plate to qualify a weld procedure and welder(s) with the intent to perform welding on steel pipe fabricated from T-1 steel. SAE AMS 6386 is also a specification for T-1 steel in sheet and plate form, and material previously fabricated in accordance with SAE AMS 6386, Type 2, and ASTM A517 Grade B may be used interchangeably with ASTM A514 Grade B to qualify a welder or weld procedure under this standard.
Two Weld Procedure Specifications (WPS) were developed for welding of T-1 steel plate/pipe up to a maximum of 2" thickness.
The following documents were generated based on welding a ¼" plate and, per Code permits, qualified welders to weld up to ½" thick T-1 steel:
a. WPS NASA 34-014-1-1-1
b. Procedure Qualification Record (PQR) NASA 34-014-1-1
c. Procedure Qualification Record Data (PQRD) NASA 34-014-1
The following documents were generated based on welding 1" plate and, per Code permits, qualified Welders to weld T-1 steel from ½" thick to a maximum of 2" thick:
a. WPS NASA 34-014-2-1-1
b. PQR NASA 34-014-2-1
c. PQRD NASA 34-014-
This SSTD applies to all contractor and subcontractor personnel involved with the GTAW welding of T-1 steel.