Submerged Arc Welding (SAW) Flashcards
7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Submerged Arc Welding (SAW) flashcards as text
In SAW, what is a 'fused flux' and how does it differ from an 'agglomerated flux'?
Answer: Fused flux is melted and solidified into glassy granules; agglomerated flux is bonded with chemicals at low temperature
Fused fluxes are manufactured by melting raw materials and crushing the solidified glass, while agglomerated fluxes bond ingredients with binders at low temperature allowing alloy additions.
What is the purpose of 'run-on' and 'run-off' tabs in SAW?
Answer: To provide a location for arc starting and stopping outside the joint to avoid defects at weld ends
Run-on and run-off tabs extend the weld start and stop beyond the actual joint, ensuring full fusion and avoiding crater cracks or lack of fusion at the ends.
What does 'basicity index' indicate about a SAW flux?
Answer: A measure of the flux's acid-base chemistry affecting notch toughness and oxygen content of the weld
Basicity index (BI) measures the ratio of basic to acidic oxides in the flux; higher BI generally produces lower weld oxygen content and better notch toughness.
Which welding position is SAW best suited for and why?
Answer: Flat (1G/1F) because gravity keeps the molten flux and weld pool in place
SAW is primarily used in the flat position because the molten flux and large weld pool must be supported by gravity to prevent spillage and ensure proper coverage.
What is 'melt-off rate' in SAW and what primarily controls it?
Answer: The rate at which electrode wire is consumed, primarily controlled by welding current
Melt-off rate is the weight of electrode consumed per unit time, and it is primarily controlled by welding current (amperage).
When using AWS A5.17 classification, what does the 'F' prefix in a flux designation (e.g., F7A2) indicate?
Answer: The flux classification, with the number indicating minimum tensile strength of weld metal in 10 ksi increments
In AWS A5.17, 'F' stands for flux, and the following number (e.g., 7) indicates the minimum tensile strength of the weld metal (70 ksi) when used with the classified electrode.
What is 'arc blow' in SAW and which condition most commonly causes it?
Answer: Magnetic deflection of the arc due to DC welding near the end of a joint or at geometric changes
Arc blow occurs when stray magnetic fields deflect the DC welding arc, most commonly near the ends of a joint or at changes in joint geometry.