BOC Smootharc Multi 180 - Electrode Selection and Parameters

52
BOC Smootharc Multi 180/200 Operating manual
Electrode type and size
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 specic classes of work. Often, one electrode in the group will be
more suitable for general applications due to its all round qualities.
The table following 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.
The size of the electrode is generally dependent on the thickness of the
section being welded, and the larger the section the larger the electrode
required. In the case of light sheet the electrode size used is generally
slightly larger than the work being welded. This means that if 1.5 mm
sheet is being welded, 2.0 mm diameter electrode is the recommended
size. The following table gives the recommended maximum size of
electrodes that may be used for various thicknesses of section.
Electrodes and typical applications
Name AWS Class. Application
BOC Smootharc 13 E6013
A premium quality electrode for general
structural and sheet metal work in all
positions including vertical down using
low carbon steels
BOC Smootharc 24 E7024
An iron powder electrode for high speed
welding for H-V llets and at butt joints.
Medium to heavy structural applications
in low carbon steels
BOC Smootharc 18 E7018-1
A premium quality all positional hydrogen
controlled electrode for carbon steels in
pressure vessel applications and where
high integrity welding is required and for
free-machining steels containing sulphur
BOC Smootharc S 308L E308L
Rutile basic coated low carbon electrodes
for welding austenitic stainless steel and
di󹟾cult to weld material BOC Smootharc S 316L E316L
BOC Smootharc S 309L E309L
Rutile basic coated low carbon electrode
for welding mild steel to stainless steel
and di󹟾cult to weld material
Recommended electrode sizes
Average plate or section thickness Max. recommended electrode dia.
≤1.5 mm 2.0 mm
1.5–2.0 mm 2.5 mm
2.0–5.0 mm 3.15 mm
5.0–8.0 mm 4.0 mm
≤8.0 mm 5.0 mm