Week 2 Flashcards
Type of current usually used for TIG on aluminum?
A.C (alternating current)
A separation at the joint root between the work pieces? (this question came up twice)
Root opening
What are 4 weld positions? Flat, Horizontal, Vertical and?
Overhead
What does A. W.S stand for?
American Welding Society
Ratio of Duty cycle is
___time and___time?
Arc;total
Welding is a safe occupation if proper precautionary measures are always?
Observed
Wearing proper eye protection while welding prevents?
Arc flash
To Prevent illness due to over exposure to hazardous materials from the fume plume you should avoid?
Brething the fumes
When welding on exotic metals, use?
Mechanical exhaust
When the electrode holder is not in use, hang it in the gas cylinders true or false?
False (hang in the bracket)
Shield others from____ causing arc flash while welding.
Ultra violet rays
Correct undercutting by_____ at each side of the weld.
Pausing
Slang terms for SMAW
Stick welding
Negative electrode to positive work piece?
D.C.E.N (straight polarity welding)
In all welding a weld pool must be protected from contamination by the atmosphere in the welding process. This is accomplished by either gasses produced by_____ or in the electrode at it is consumed by shielding____ introduced in the arc.
Coating;gas
What are the disadvantages of FCAW, Is the require of_____removal and _____ cleaning
Slag; weld
What are the disadvantages of FCAW, Is the require of____?
All work and tools are hot
Electric arc process that produces coalescence of metals by heating them with an arc between a continuous filler metal electrode and the work piece?
GMAW (gas metal arc welding)
Type of welding that normally uses direct current electrode positive?
Gmaw
The _____ drives the electrode wire from the wire spool through the cable and gun to the welding arc
Wire feeder
The push system is designed to push wire through the wire? (cant recall the question to this one but the answer was PUSH)
Wire conduit(liner)
What system displaces air around arc to prevent contamination of the molten pool by oxygen and nitrogen in the atmosphere?
Shield gas system
Two gases aided for mild/low alloy steel. (remember the percentages too)
Argon (75% A.R)
Carbon dioxide (25% C.O.2)
Steel wires normally have thin_____ wire to improve electrical pick up and protect the wire from oxidation
Copper
FCAW can be used in either D.C.E.N and D.C.E.P current true or false?
True
In the FCAW process the shielding of the weld is provided by a______ ?
Flux cord
In GTAW the tungsten electrode is only use to produce _____which creates a puddle in the base metal.((this question try to remember the base metal. I forgot how this one was)
Arc
Three things TIG welder must control? (this one was fill in the blank)
Torch position
Filler rod depositing
Speed of travel
In G.T.A. W, what are the two most common shielding gases. One is Argon and the other ______?
Helium
Two great qualities tungsten is used for. (fill in the blank)
High melting point
Excellent electrical conductor
Ferrous and nonferrous can be cut by plasma process?
True
Reverse polarity is not generally use in TIG welding because it can____ the tungsten electrode.
Melt
Plasma are cutting is a____ cutting process.
Thermal
Air carbon arc cutting is commonly used in?
Gouging and cutting
The application of heat to the base metal immediately____welding, brazing, soldering, thermal spraying or cutting.
Before
Welding should or should not be done when the ambient temperature is below 0 degrees Fahrenheit?
Should not
A TIG welding torch head can only be cooled with water true or false?
False(air too)
Before a welder can begin work on any job, they must be? (This one was worded a bit different
Certified
If the welder uses different process or if the welding procedure is drastically altered?
Re-qualification is required
What is the most widely used and most popular weld inspection?
Visual
A liquid dye penetration kit is destructive method is used to find minute discontinuities flaws in a weld? (This question is not word for word
False
When gas cylinders are empty, close the valve and mark cylinder?
Empty
What kind of electrode is E6010?
Coated electrode for S.M.A.W that has
62000 P.S.I
“1” Can be welded in any position on carbon steel.
*O” means manufactures characteristics.
What kind is ER70S-6
Electrode is a solid wire that can be used as filler rod in G.M.A.W and G.T.A.W
70000 P.S.I
The “6” is wire chemistry
What kind is ER316L?
316 stainless steel Electrode Rod or wire that can be filler metal in G.M.A W or G.TA.W
L means low carbon
What kind is E71T-1?
Flux cored electrode that cannot be used as filler metal. Used in F.C.AW.
70000 P.S.I
“I’“‘means it can be welded in all positions
“T”’ means it is tubular.
“-1” identifies as selfshielded. Used on carbon steel
8 Ways to control distortion
- Use fixtures and other clamping devices to restrain the movement of welded parts and allow the weld metal to stretch during welding.
- Use gusset plates, strongbacks, and tie-bar braces to restrain movement of parts during welding.
- Do not allow the weldment to overheat in an isolated area to equalize expansion forces
- Use a minimum amount of bevel angle and root gap opening on groove welds to reduce the amount of weld metal that will shrink.
- Always weld in the same direction with all passes to keep the expansion forces moving evenly in the same direction.
- Use chill bars (heat sinks) when welding light gage metals to draw away heat from the weldzone and prevent overheating and excessive expansion.
- Do NOT Overweld! This adds nothing to the strength of a weldment, and it increases the amount of heat expansion and weld metal shrinkage.
- Use a limited number of weld passes by using larger diameter electrodes or a different welding process to limit weld shrinkage.
All position certified weld
6g
What is developed when there is good penetration on a root weld?
Keyhole
Type of welding that is shielded from an inert gas supply.
GMAW
Reverse polarity
DCEP
Vertical position weld
3g
Type of welding that utilizes a rod coated with a baked flux.
SMAW
Electrode is negative?
Dcen
Flat fillet weld position
1F
Burns out impurities after the root pass
Hot pass
Covers the weld deposit and provides additional protection from the atmosphere
Slag
Type of welding where a tubular or cored electrode is used.
FCAW
Type of welding that uses a tungsten electrode.
G.T.A.W
