The organization is to complete a minimum of one heat treat part job audit during each assessment. This
should be done preferably on a part identified for one of the customers requiring compliance to this
document. More part job audits may be done if time permits. Preferably, safety or critical parts should be
audited. This may not be easily determined with fasteners, especially if the fastener manufacturer does not
identify the end customer (auto manufacturer, tier one, etc.). It is recommended that the job audit be
performed at the end of the heat treat system assessment.
The job audit is not the only or main focus of the HTSA. The other three sections on Management
Responsibility and Quality Planning, Floor and Material Handling Responsibility, and Equipment are
equally if not even more important. The job audit of one part, one heat process, and one furnace is not
sufficient to use as a basis to complete the other sections of the complete HTSA.
The job audit is a compliance type audit/review of a specific part and its related paperwork and
processing, including heat treat equipment and processing records for that job from the beginning receipt
of a part through processing in the heat treat operation and inspection to packaging. Parts shall be taken
from the shipping area at the dock or the end of the heat treat operation. If an automotive manufacturer’s
part is not available or identifiable, then parts from other customers requiring compliance with this
document shall be used for the assessment.
The part or lot checked shall represent a major heat treat operation such as quench and tempering,
carburizing and tempering, induction hardening for steel, solution treating and aging of aluminum, etc. In
subsequent heat treat system assessments, different parts and heat treat processes shall be checked.
The specific heat treat processing parameters (applies to 4.7 in the Job Audit) that are required in the job
audit shall be added to the job audit form. This can be done by reviewing the customer specification(s),
the Control Plan, the FMEA, and the floor work/job order. Each processing step shall be reviewed for
proper production records/compliance/inspection. These steps can be compared to those in the Heat Treat
System Assessment for the actual job/heat treat process being reviewed for compliance. The heat treat and
furnace records for the actual time frame/shift etc. that the job was processed shall also be checked. The
actual furnace equipment and instrumentation certification shall be verified as being in compliance to the
appropriate equipment requirements in the equipment section.
For specific heat treat parameters that are proprietary (applies to 4.7 in the Job Audit), the heat treat
supplier may enter the controlling document number, e.g., control plan or process sheet, on the Job Audit.
The parameters shall be available to the auditor for review but proprietary information is not required to
be documented in the Job Audit.