HG soldatech EL120HG, User Manual, Page: 31 / 39

ENG
31
Judge a good weld bead
hen the trick of establishing and holding an arc has been learned, the next
step is learning how to run a good bead. The first attempts in practice will
probably fall short of acceptable weld beads. Too long of an arc will be held or
the travel speed will vary from slow to fast (see following)
A. Weld speed is too fast.
B. Weld speed is too slow.
C. Arc is too long.
D. Ideal weld.
A solid weld bead requires that the electrode be moved slowly and steadily
along the weld seam. Moving the electrode rapidly or erratically will prevent
proper fusion or create a lumpy, uneven bead. To prevent ELECTRIC SHOCK,
do not perform any welding while standing, kneeling, or lying directly on the
grounded work.
Finish the bead
As the coating on the outside of the electrode burns off, it forms an envelope
of protective gasses around the weld. This prevents air from reaching the
molten metal and creating an undesirable chemical reaction. The burning
coating, however, forms slag. The slag formation appears
as an accumulation of dirty metal scale on the finished weld. Slag should be
removed by striking the weld with a chipping hammer.