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83
varying external conditions. Warnings of conditions requiring the operator's
attention must be given during welding. Should a situation occur in which the
quality of the weld is jeopardized, the process must be stopped in a
controlled manner and the reason for the stop must be displayed. Upon
completion of the weld, a presentation, indicating all the important events
during the welding cycle, should be made to determine the amount of non-
destructive testing. Provision should be made for further detailed
investigations of optional parts of the cycle, as well as for the storage and
documentation of the course of the process.
The operator interface for the ESAB multi-run MMC is an industrial
PC. The pre-programming modules are divided into blocks of set-up
parameters, process parameters, warnings, reports and stop limits. Different
sets of process parameters can be automatically retrieved during the welding
sequence. During welding, the screen shows the preprogrammed parameters,
the actual measured values and the way the process is progressing (e.g. layer,
bead and position).
If a warning is activated, the operator is given the choice of
immediately stopping the process, stopping it after the completion of the bead
or allowing it to continue.
A small remote control box, which can be hand-held, contains the
controls the operator needs for preparing, starting and stopping the process.
The control system registers the welding sequence in two separate files, the
Weld Report and the multi-run. In the Weld Report, all the installation
parameters such as wire type and wire dimension, flux (or gas) type and
permissible inter-pass temperatures are stored, together with the specified
process parameters such as welding voltage, welding current and welding
speeds and their report, alarm and stop link.
All the important events during welding, such as start, stop(s), restarts,
exceeded report limits and warnings for flux level, high or low interpass
temperature, are stored in the Weld Report. All the events are stored together
with the actual date, time, weld layer, weld bead and position in the joint.
Should the event be an exceeded process parameter, the parameters at the
time in question are also stored.
In the Log File, the position and process parameters are continuously
registered (every 20 mm). A normal Log File report for a thick-walled
welding object could fill 1,000 pages.
The Weld Report provides a good overview of important events during
welding. The reported events provide valuable information for the planning
of non-destructive testing and offer easily-accessible documentation of the
welding process. If further investigations are deemed necessary, the Weld
Report constitutes a good register for entering the Log Files in which detailed
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