PREN 16771 : DRAFT 2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Information to be supplied
  by the railway authority
5 Approval procedure
6 Re-approval following process changes
7 Laboratory tests
Annex A Annex A (informative) - Steps in approval
Annex B (informative) - Suggested sequence of
        laboratory tests
Annex C (normative) - Procedure for FRY etching
Annex D (normative) - Procedure for measurement
        of surface hardness
Annex E Annex E (normative) - Procedure for slow
        bend test
Annex F (normative) - Procedure for recording test
        weld fracture face defects
Annex G (normative) - Ultrasonic inspection
        procedure on aluminothermic welds to
        be sectioned
Annex H (normative) - Procedure for microscopic
        examination of the visible heat affected zone
        and fusion zone of welds
Annex I (normative) - Procedure for measurement
        of the heat softened zone width

Describes the laboratory tests and requirements for approval of an aluminothermic welding process using welds produced in workshop conditions.