The patented nubs automatically set the weld gap for the root-pass. The internal bevels and flat inner lands assure non-restricted fluid flow. The Robvon backing ring eliminates the necessity of tack welding and it also eliminates slag, icicles or metal inside the bore which create obstructions, which and can cause damage to valve seats and strainers when broken loose.
Backing Ring Styles
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Robvon "CCC" Backing Ring Designed for quick easy joint alignment where the variation in inside diameters is relatively great. |
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Robvon "CC" Backing Ring Designed primarily for automatic welding and to allow quick and easy joint alignment where the inside diameters are slightly out-of-round. Nubs can be chipped off or left intact to be melted into first root pass. |
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Robvon "Plain" Backing Ring Designed for quick and easy joint alignment, and for manually setting the root gap. |
Backing Ring Welding Procedure
To see the Backing Ring Welding Procedure
Material's Available:
| Carbon Steel | ASTM A-109 | ASTM A414/ASME SA-414 |
|---|---|---|
| Chrome Moly | ASTM A-182/ASME SA-182 | F-11, F-22 |
| Stainless Steel | ASTM A-240/ASME SA-240 | 304, 304L, 316, 316L, 321, 347 & Others |
| Aluminum | ASTM B-221/ASME SB-221 | 3003, 5086 & 6061 |
| Copper Nickel | MIL-C-15726(F) | CDA-706, CDA-715 |
**Other weldable materials available upon inquiry; e.g., special grades of Chrome Moly, Stainless Steel, Nickel, and Cupro Nickel and Other's.
Backing Ring Ordering Information, Specify:
Quantity
NPS & Schedule or Tubing O.D. & Wall
Backing Ring type - "CCC", "CC" or Plain
Material & Grade
Example: ( 50 pcs - 6" std Robvon "CCC" Carbon Steel A-109)
Nominal Pipe Size or Tube OD range from 1" to 36 "
38" and larger are available upon request.
Note: All rings are marked on inside diameter with:
Size, Sch, Heat No., Material Grade & Robvon Company Identifier
General Backing Ring Information
Backing Rings are manufactured with the following ring gaps included, but are not limited to, 3/32" or .030" on sizes 4" and smaller; 5" and larger exhibit a 1/8" or .040" gap.
To view a table showing Robvon's Standard Backing Ring;
Dimensions, Ring Weights & Spacer Pins
"CCC" Spacer Nub lengths include, but are not limited to, 3/4" long on "CCC" ring types with 1/8" and 3/16" diameters; 1/8" and 3/16" diameter ball-type nubs on "CC" ring types.
