Operating instructions
15BOC Smootharc Advance II MIG 250C Operating manual
Having decided on a welding machine, appropriate accessories are
required. These are items such as welding cables, clamps, electrode
holder, chipping hammer, helmet, shaded and clear lenses, scull cap,
gloves and other personal protective equipment.
BOC stocks a huge range of personal protective equipment. This
combined with BOC’s extensive network ensures fast reliable service
throughout the South Pacic.
3.4 Welding Technique
Successful welding depends on the followingfactors:
→ selection of the correct electrode
→ selection of the correct size of the electrodefor the job
→ correct welding current
→ correct arc length
→ correct angle of electrode to work
→ correct travel speed
→ correct preparation of work to be welded.
3.5 Electrode Selection
As a general rule the selection of an electrode is straight forward, in that
it is only a matter of selecting an electrode of similar composition to the
parent metal. It will be found, however, that for some metals there is a
choice of several electrodes, each of which has particular properties to
suit specic classes of work. Often, one electrode in the group will be
more suitable for general applications due to its all round qualities.
The table (on the next page) shows just a few of the wide range of
electrodes available from BOC with their typical areas of application.
For example, the average welder will carry out most fabrication using
mild steel and for this material has a choice of various standard BOC
electrodes, each of which will have qualities suited to particular tasks.
For general mild steel work, however, BOC Smootharc 13 electrodes
will handle virtually all applications. BOC Smootharc 13 is suitable for
welding mild steel in all positions using AC or DC power sources. Its easy-
striking characteristics and the tolerance it has for work where t-up
and plate surfaces are not considered good make it the most attractive
electrode of its class. Continuous development and improvement of
BOC Smootharc 13 has provided in-built operating qualities which
appeals to the beginner and experienced operator alike. For further
recommendations on the selection of electrodes for specic applications,
see table on the next page.