SMAW Fundamentals
The name of the textbook.
What is Welding Processes, Part 1?
The part of the SMAW electrodes that provides shielding, stabilizes the arc, and influences weld metal properties.
What is the electrode covering.
Three types/polarities of welding current that can be used for SMAW.
What is AC, DCEP, and DCEN.
The distance between the tip of the electrode and the weld pool.
What is arc length?
Two methods used to apply the covering to a SMAW electrode during manufacturing.
What are extrusion and dipping?
These electrodes require storage in a heated rod oven.
What is low-hydrogen electrodes?
This type of volt/amp response curve most often used for SMAW.
What is constant current (CC).
The weld discontinuity likely to appear at the arc-initation if the welder begins traveling before adequate shielding is established.
What is porosity?
Three advantages of SMAW.
What is:
- Simple, inexpensive, portable equipment
- Shielding gas is not required
- Less sensitive to wind
- Easy access in hard-to-reach joints
- Can weld most common metals and alloys
- Can weld in all positions
E6010 and E6011 are examples of this type of SMAW electrode, characterized by a forceful, digging arc, deep penetration, and primarly gas-based sheilding.
What are cellulosic electrodes?
What this measurement is called, and what it means: 60% at 200A.
What is duty cycle. 60% at 200 amps means the maching can be used for 6 minutes out of a 10 minute cycle when being used at 200 A.
The welding issue that can appear when significant residual magnetism is present in the base metal.
What is arc blow?
Two reactive metals unsuitable for welding with SMAW.
What is titanium, zirconium, tantalum, niobium?
Define the following: E7018-H4R
E = electrode
70 = 70,000 PSI minimum UTS
1 = All positions
8= Type of coating and current
-H4 = Diffusable hydrogen below 4ml/100g weld metal
R = meets H2 requirements
On a drooping V/A curve, what affect shortening the arc length has on current and arc voltage.
Voltage decreases, and current increases
The percentage of time a welder spends actually welding, expressed as a percentage.
What is operator efficiency?
The definition of SMAW.
What is an arc welding process that uses an arc between a covered electrode and a weld pool to accomplish the weld. As the welder steadily feeds the covered electrode into the weld pool, the decomposition of the covering evolves gases that shield the weld pool.
Define the following: E310MoL-15
E= electrode
310 = Alloy designation
Mo = Molybdenum
L= Low Carbon
1= All positions
5= DCEP only
The five types of welding power sources.
What is AC transformer, transformer-rectifier, motor-driven, engine-driven, and inverter
Three methods that can mitigate or eliminate arc blow.
What is
-Moving the ground to a different position
-Winding the ground around the work
- Weld in the opposite direction
- Preheat
- Heat the BM with a hammer
- Switch to AC