What happens to your weld when the current is too high?
Amps too high
A deep crater has formed at the end of the weld, and the slag is difficult to remove from the edges of the weld. Excessive current should not be compensated by excessive travel speed. This can result in slag inclusions due to rapid cooling of the weld.
How welding current can affect our weld beads?
Welding current is an important parameter which affects the weld bead shape. The current controls deposition rate because it controls the melting rate of the electrode. The amount of melted base metal, the HAZ, depth of penetration is controlled by the welding current.
How does current affect weld?
The welding variable that has the greatest effect on the degree of weld penetration is current (measured in amperage or amps). Quite simply, as welding current increases (i.e., more amperage), weld penetration increases and as welding current decreases (i.e., less amperage), weld penetration decreases.
What problems may result by using an electrode at too high of a current setting?
The weld is the result of too much current. When the amperage is set too high, the puddle will be excessively fluid and hard to control. This can lead to excess spatter and higher potential for undercut.
What are the effect of too high or too low current setting?
If current on equipment is too high or too low, you are certain to be disappointed in your weld. If too high, the electrode melts too fast and your molten pool is large and irregular, if too low, there is nor enough heat to melt the base metal and your molten pool will be small, will pile up, look irregular.
What is the importance of current in welding?
The welding current also affects the weld penetration profile. Holding all other variables constant, as the welding current increases the further the weld will penetrate into the base material. This increase in weld penetration is seen in Welds 1-5, Figure 1.
How do welders increase amperage?
The adjustments to Stick welding amperage to compensate for steel material thickness are similar to the processes necessary to compensate for material thickness with a MIG welder. Stick welders have a simple control knob on the front of the machine which adjusts the amperage level with the twist of your wrist.
How do welders choose current?
The correct current, or amperage, setting primarily depends on the diameter and type of electrode selected. For example, a 1/8-inch 6010 rod runs well from 75 to 125 amps, while a 5/32-inch 7018 rod welds at currents up to 220 amps. The side of the electrode box usually indicates operating ranges.
What is current in welding?
WELDING CURRENT The welding current is the electrical amperage in the power system as the weld is being made. It is usually read from the power source meter, but a separate ammeter is often used. … In other words, an increase (or decrease) in the wire-feed speed will cause an increase (or decrease) of the current.
How much current is needed for welding?
As the welding processes require high current (50-300A) at relatively low voltage (10-50V),the high voltage mains supply (230 or 400V) must be reduced by a transformer.
What is the effect of having a low current in welding?
Low currents of course can lead to small weld nuggets and low weld strength or no weld at all.