John L Gray Consulting Metallurgist
General Experience
  • Project management of failure investigations utilising other specialist testing services such as; 
    • Strain gauging 
    • Finite element analysis 
    • Fracture mechanics 
    • Crack testing 
  • Chemical analysis 
  • Provision of metallurgical and general consultancy covering material selection, heat treatment, corrosion mitigation, casting, forging, welding, fabrication and the development of metallurgical processes
Professional Experience

1998 - Present

John L Gray Pty Ltd
Principal Consulting Metallurgist

1991 - 1998
Positions Held:

ETRS Pty Ltd - NSW
Principal Materials Consultant - NSW

Responsible for Responsibility for the performance of and or supervision of all consulting briefs in the field of;

  • Metallurgical Failure Analysis 
  • Corrosion 
  • Welding 
  • Fitness for Purpose of Materials 
  • Materials Selection 
  • Heat Treatment Requirements 
  • Surface Coating Requirements 
  • Metallography 
  • Routine Laboratory Testing

Clients included the Manufacturing Industry, Building Industry, Insurance Industry, Legal industry, and Government Authorities.

1968 - 1991
Positions Held:



State Rail Authority
Technical Services Manager - REM North
Manager Material Investigations
Works Metallurgist

Over this period duties included: 

  • Metallurgical failure investigations 
  • The management of technical investigations 
  • The provision of metallurgical services to outside industry 
  • General consulting in Corrosion, Welding, Fitness for Purpose of Materials, Materials Selection, Heat Treatment Requirements and Surface Coating Requirements 
  • Metallography

Awarded the 1988 NSW Permanent Way Achievement Award for "Wirefeed Welding of Rail Crossings"

Recent Investigations
  • Catastrophic damage to a yacht - Coronial Inquest 
  • Winery explosion - Coronial Inquest 
  • Prosthesis failure 
  • Rod rigging failure 
  • Roof purlin failure 
  • Mobile crane failure 
  • The mechanical failure of various automotive components