X65 Impact Toughness

  • CVN tests used as primary acceptance criteria for HPW
  • Hammond criteria for X65 half size CVN specimens tested at 0 deg. C:

  • 63 welds produced under "ideal" laboratory conditions over broad range of parameters (see table.)

  • Welds with consistently low toughness had poor weld parameters and failed the first criteria (9%).
  • Welds with single low value had low displacement weld parameters and only failed second criteria (5%).
  • 84% of welds had superior impact toughness (average > 81 J)

CONCLUSION
  • Excellent toughness easily achieved in HSLA X65 line pipe with modified weld parameters over broad range of weld parameters.
  • Low toughness avoidable by careful selection of weld parameters.

Additional Pages on Homopolar Welding:

Program Description

The Program

Basics of Homopolar Welding

Homopolar Generators

Homopolar Welding Parameters

Weld Parameters and Results Using Modified HPW Method

Joining 12 Inch Pipe in 3 Seconds

X-65 Impact Toughness

Real World Welding Conditions

Commercial Hompolar Welding Systems

 

For further information please Contact:

Dr. Robert Hebner

(512) 232-1628