Exam (elaborations)
TE-152 SHEET METAL REVIEW FOR FINAL
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TE-152 SHEET METAL REVIEW FOR FINAL
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TE-152 SHEET METAL REVIEW FOR FINALAcetylene is a shielding gas, not a fuel gas. True or false - answer- False
It is ok to use oxygen like you would compressed air to dust off clothes and your body. - answer- false
It is ok to remove the steel cylinder cap on a compressed gas cylinder before the cylinder is secured as long as you are careful. - answer- false
When fixing trim, always start with __________________________________.
A- The tiny anvils and cute hammers sold for the purpose.
B- A cinderblock.
C- The biggest most badassest hammer you can find.
D- A giant bong hit--maybe two.
E- Nice replacements you've stolen off of someone else's car.
F- The least aggressive tools you can find. - answer- F- The least aggressive tools you can find.
If fittings on a torch, its hoses, or the cylinder valve become stubborn, you should put oil
on them. - answer- false
You only need to open the cylinder valve on an oxygen cylinder a half turn. Acetylene you will open all the way. - answer- false
When MIG welding thicker steel, rather than thin autobody steel, you will want to run hot
and juicy continuous beads. The technique your dog saliva-covered instructor demonstrated where you place a series of small welds adjacent to one another is for THIN STEEL ONLY. - answer- true
Welding relies on resistance in the circuit. That resistance is provided by a small gap the electricity must cross. - answer- true
The tungsten electrode used in TIG welding is an example of a consumable electrode while the wire used in MIG welding is a non-consumable electrode. - answer- false
Exposure to IR (infrared light as produced during torch welding) and UV (ultraviolet light as produced in MIG and TIG welding) can cause cataracts to develop over time - answer- true
A machine's duty cycle in measured in the amount of time an arc can be on in a 10-
minute span. Thus, a 40% duty cycle means you could weld 4 minutes out of 10 before letting the machine cool. - answer- true
A MIG gun cable that gets tightly wrapped, coiled or twisted will last longer. - answer- false The most common consumable on a wirefeed (MIG) gun is the contact tip. These are sized according to the wire that gets run through them. - answer- true
A spool gun is different from a normal wire gun. A small spool of wire is literally mounted
on the gun and the wire is fed between the drive rolls to the weld area. Spool guns are often used for MIG welding aluminum. - answer- true
An American Welding Society designation number such as ER70S-6 tells the user more
about the size of the wire than the content. - answer- false
The shielding gas we use, known as C25 because it is 75% Argon and 25% CO2, penetrates less than pure CO2 and has a smoother appearance. - answer- true
Too much wire stickout during MIG welding will compromise shielding-gas flow and create an uneven bead. Welding this way reduces the amount of heat in the base metal - answer- true
For oxy-acetylene torch cutting, you'll secure the cutting attachment to the torch handle with a wrench. - answer- false
When cutting with the oxy-acetylene cutting torch, you'll use the same gas pressures you use for welding - answer- false
The oxy-acetylene torch will cut aluminum, stainless, brass, and copper as well as it cuts mild steel. - answer- false
When cutting a mystery container with an oxy-acetylene torch or plasma cutter, there is no need to worry about what was once in the mystery container. If time has passed, the danger likely has too. - answer- false
If you cannot get your plasma cutter to cut, the problem is likely either a failure to ground or one of the small parts in the tip is worn. - answer- true
When an acetylene cylinder is getting very low the tip will drip fire. - answer- true
You will always tighten torch tips by hand. You will tighten the other fittings with a wrench. - answer- true
According to the 1/7 rule, you should not use a tip on the oxy-acetylene torch that will flow at a rate greater than the cylinder can provide. Multiplying the flow rate of the tip times seven will give you the minimum size cylinder you can safely use. (e.g. a tip flowing 20 cfh needs a cylinder with a capacity of at least 140 cubic feet). - answer- true The oxy-acetylene torch is portable and will weld steel and aluminum on old cars just fine. It will only cut plain carbon steel, however. It will not cut stainless steel, aluminum, or brass. - answer- true
A carburizing flame will have a long feather in the middle of the flame. It will have too much acetylene and can leave carbon behind in the weld, which could make the weld brittle. - answer- true
A neutral flame has equal amounts of oxygen and acetylene in the mix. It has a single short blue cone. As the purest flame, this is the one we will use for welding on the old cars we hold so dear. - answer- true
The oxidizing flame has an excess of oxygen. It is characterized by a short flame that hisses like an angry possum you've cornered in the garage. It is not good for welding - answer- true
A backfire, also known as "torch pop," is a loud sound created by a small explosion of weld gasses inside the tip. - answer- true
Torch pop can be caused by a tip that is starved for fuel. - answer- true
Torch pop can be caused by a tip that is dirty or has an obstruction. - answer- true
Torch pop can be caused if you accidentally touch the tip to the work. - answer- true
Torch pop can be caused by a tip that gets too hot - answer- true
Flashback is when the torch flame retreats back up into the lines, which can be very dangerous - answer- true
A scraggly old coat hanger will generate the same quality weld as a welding filler rod with an American Welding Society designation. - answer- false
Heating the end of the filler rod and melting off little drops to add your weld is a bad idea
according to the author because the oxidized droplets will contaminate the weld. In addition, this technique will not work with vertical or overhead joints. - answer- true
When setting up an oxy-acetylene outfit, the most important factor in determining what torch tip to use for welding will be the thickness of the metal. - answer- true
Be sure to turn the Oxygen cylinder on a 1/2 turn and the Acetylene cylinder on all the way. - answer- false
When selecting a filler rod for torch welding steel, the bigger the filler rod you pick, the larger the weld will be - answer- true
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