Where should the arc be restarted or struck on a previously unfinished bead?
Where should the arc be restarted or struck on a previously unfinished bead? About 3/8″ (10m) in front of the forwards edge of the crater. Gravity causes the metal in the arc to fall as it travels across the arc.
What must be done after each SMAW bead is completed the welder must?
Each weld bead must be cleaned before the next bead it started. Slag left on the plate between welds cannot be completely burned out because filler welds should be made with a low amperage setting.
What are the three main adjustments to the machine for proper welding of a bead?
E. Most MIG welding units have three adjustments which must be in balance to achieve a quality weld. These are voltage control, wire feed speed, and shielding gas flow rate.
What should welders wear to protect their eyes from arc flashes coming from behind them?
Prevention of flash burn
Protect the cornea from UV light by wearing coated safety goggles. Always wear a welder’s mask when welding. Make sure the goggles are made to Australian Standards and cover the eyes completely.
What does a bead that was made with too long an arc gap look like?
A weaving bead? What does a bead that was made with too long an arc gap look like? sag down and cause overlap.
What is the difference between 7018 and 7014?
The biggest difference would be the storage of the rods because the 7018 has a low-hydrogen coating on them, while the 7014 has an iron powder coating. Besides this, the 7014 rod has almost the same characteristics as the 7018 while being more suitable for beginners.
What four factors must an arc welder control in order to produce an acceptable bead?
The movement or weaving of the welding electrode can control the following characteristics of the weld bead: penetration, buildup, width, porosity, undercut, overlap, and slag inclusions.
What are the 5 SMAW operation set up?
SMAW Operation Set-up
- Clean the workpiece.
- Clamp the work close to the weld.
- Insert the electrode into the insulated holder holder. Set amperage at levels recommended by the electrode manufacturer.
- Determine the best arc length. …
- Have a chipping hammer available to remove any slag and before doing a 2nd pass with the weld.