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6-38 / Welding
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Welding
6-26. Welding Instructions
6-26.1 Welding on Frames
All Pierce Custom Chassis frames are manufactured from high strength heat-treated steel that will lose its strength
when welded upon. Do not weld on frame rails.
6-26.2 Before Welding
This section defines the requirements for disconnecting electronic components before all welding operations.
Before welding, disconnect all electronic components listed in Table 6-8. Special electrical system configurations
may include additional electronic control units that may require disconnection before welding on the vehicle. Most
electronic component connectors that require disconnection when welding on the vehicle are identified by a
“Connector Disconnect Tag” (P/N 91-0250).
Welding on a truck may cause voltage surges to be distributed throughout the truck’s electrical system.
Electronic components, which are connected to the electrical system, may be damaged due to these
high voltage surges. Electronic components may fail at relatively low voltages caused by a brief
welding operation done on the truck.
Before any welding is done on a multiplexed unit, make sure ALL electronic modules and control units
(ECUs) are disconnected. Refer to the Pierce Service Manual, group 0950-P-008, ECU, PMC, and Power
Module Location Guidelines, and the applicable multiplex documentation for component locations.
Also be sure to disconnect the following, as applicable: engine ECU, transmission ECU, anit-lock brake
system ECU.
Do not weld on heat-treated frame rails or frame failure leading to property damage, personal injury, or
death may result.
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