Chapter 28 Flashcards
Adjustments for proper amperage is vital for _____________________.
arc establishment
a plate or __________________
coupon of steel
If using _______________, it is important that the machine is set for straight or reversed current.
DC polarity
Oscillation
keeping the tip of the rod weaving back and forth across the molten weld pool.
proper amperage
vital for arc establishment.
scratching motion method
requires that the electrode be brought down at an angle to the plate similar to scratching a match. When the arc is started (flashes) the electrode must be quickly raised so that it will not stick to the base metal.
striking an arc
There are two methods that can be used : a tapping or a scratching motion.
stringer beads
an excellent bead for beginning welders to make.
tapping method
requires that the rod be held directly above the work. The rod is brought down and touches on the base metal. As the arc strikes, the rod must be quickly brought up to approximately the thickness of the electrode or the rod will stick to the base metal.
weave bead
a crescent-shaped zig-zag.
o Hesitate at sides to prevent undercutting and to allow the bead to build.
o Be sure to bond the weave to the material on each side.
keeping the tip of the rod weaving back and forth across the molten weld pool.
Oscillation
vital for arc establishment.
proper amperage
requires that the electrode be brought down at an angle to the plate similar to scratching a match. When the arc is started (flashes) the electrode must be quickly raised so that it will not stick to the base metal.
scratching motion method
There are two methods that can be used : a tapping or a scratching motion.
striking an arc
an excellent bead for beginning welders to make.
stringer beads
