Term
| four types of welding machines |
|
Definition
1-ac transformer
2-transformer rectifier
3- dc motor generator
4- inverter |
|
|
Term
| back seating talk valves should be open ? |
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| acetylene gas is what to air |
|
Definition
|
|
Term
| propane gas is what to air ? |
|
Definition
|
|
Term
|
Definition
|
|
Term
| minimum pressure for oxygen tank |
|
Definition
|
|
Term
| describe the difference between single stage and 2 stage regulators |
|
Definition
- a single stage regulator uses only the adjustment screw to regulate pressure
-2 stage regulator uses a valve that cannot be adjusted on the back, to reduce the pressure from the adjustment screw to regulate the pressure |
|
|
Term
| the liquid inside of the acetylene tank is? |
|
Definition
|
|
Term
| acetylene must not be pressurized to more than |
|
Definition
|
|
Term
| oxygen tanks from supplier |
|
Definition
|
|
Term
| kindling temp of steel is |
|
Definition
|
|
Term
| max % of copper in acetylene fittings |
|
Definition
|
|
Term
| temp of acetylene and air |
|
Definition
|
|
Term
| the temp of oxy/acetylene |
|
Definition
|
|
Term
| shade # for oxy/acetylene cutting |
|
Definition
|
|
Term
|
Definition
|
|
Term
| petrogen cutting torch tank holds |
|
Definition
|
|
Term
| petrogen cutting torch tank weighs |
|
Definition
|
|
Term
| petrogen cutting torch tank pressurized to |
|
Definition
|
|
Term
| petrogen cutting torch tank relief at |
|
Definition
|
|
Term
| petrogen cutting torch can us % oxygen |
|
Definition
| can us 90% oxy well other tourch needs 95% |
|
|
Term
| safty feachers of the petrogen tourch |
|
Definition
. no flashback
. liquid gasoline cant combust
. turns to vapor when exits the head of the torch
. gasoline has a vapor flammability rang 1.7 to 7%
. refrigeration effect keeps tourch head cool/ and sparks cooler
. tip last longer
. no co only co2
. "fast flow" check valv will shut off flow if hose is severed
. check valve at pressure gauge
. any leacks easy to see cause its liquid |
|
|
Term
|
Definition
. fully or partly enclosed
. not intended for continuous human occupancy |
|
|
Term
|
Definition
| . oxygen deficant or enriched, exceeds |
|
|
Term
|
Definition
. any energy that can harm workers
. electric mechanical, pneumatic, chemical, radiation, thermal,
gravitational |
|
|
Term
|
Definition
immediately dangerious to life or heath
-irreversible health effects, impair persons ability to escape |
|
|
Term
| - hazerdious identification |
|
Definition
. confined spaces
. entering or near confined spaces
. hazardous atmosphere in confined space |
|
|
Term
| - examples of confind spaces |
|
Definition
. construction
. vaults
. shafts
. tunnles
. duct work
. crawlspaces
. culverts
. manerfacturing/industreal/commercial
. tanks
. mixers
. vats
. boilers
. reactors
. reservoirs
. railway tank cars |
|
|
Term
| - preheating and post-heating |
|
Definition
. preheat before welding
. postheat heating after welding
. often done to provent cracking
. heat crayons to obtain specifide tempratures |
|
|
Term
| - effects of heating and cooling |
|
Definition
. soft materials cause distortion / must be controlled
. heat causes expatiation of metal
. raped cooling causes contraction
. hard metals are also bridal
. cannot tolerate stress and fractures if hardened |
|
|
Term
| when welding and cutting why shoundent you have rooled up sleavs |
|
Definition
| avoid sparks from burning ypou |
|
|
Term
| the eye shade for stick welding |
|
Definition
|
|
Term
| lowe the eye shade number grater the shade (T) (F) |
|
Definition
|
|
Term
| in canada AC current is supplyed at ______ cycles which means polarity is _____ per second |
|
Definition
|
|
Term
|
Definition
constant current
-constant current amperage is set resistance is constantly changing |
|
|
Term
|
Definition
constant voltage
- voltage is set and resistance is constantly changing |
|
|
Term
|
Definition
|
|
Term
|
Definition
combination of flow meter and regulator
-ball in calibrated tower flow of CF/H |
|
|
Term
e stands for
70 stands for
1 stands for
8 stands for
(E7018) |
|
Definition
electrode
70000 psi tensile strength
welding position
polarity, power supply, arc, slag, and hydrogen content |
|
|
Term
|
Definition
| once out of package must be stored in oven at 250f |
|
|
Term
| low hydrogen electrode numbers |
|
Definition
|
|
Term
|
Definition
| magnetic phenomenon that causes arc to behave erratically common in DC |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Uses sintered filter to extinguish flame to prevent flame from traveling up hose or to tank |
|
|
Term
|
Definition
|
|
Term
| Oxy-acetylene torch cannot cut metals such as aluminum, brass, copper, stainless steel, cast iron because... |
|
Definition
| There is a oxide layer that melts at a higher temp than the base metal causing the metal to melt and not cut |
|
|
Term
|
Definition
| Cooling rapidly (placing hot object in water) to harden metal |
|
|
Term
|
Definition
| Gradual cooling to soften metal to give the metal "give" |
|
|
Term
| Current types for welding |
|
Definition
| AC (Alternating Current) DC (Direct Current) |
|
|
Term
|
Definition
|
|
Term
|
Definition
| positive in stinger 70% heat in stinger 30% in work |
|
|
Term
|
Definition
| negative in stinger 30% heat in stinger 70% in work |
|
|
Term
|
Definition
| burns to produce a protective coding around the weld removing impurity's |
|
|
Term
|
Definition
| 1/3 of the tensile strength |
|
|
Term
|
Definition
aids in uniform penetration and bead deposit
-makes welding faster
-corates weld with little or no spatter
-produces heavy slag that chips easy
-can use heavy current without over heating
-loses some penetration |
|
|
Term
|
Definition
| Heat Affected Zone cracking |
|
|
Term
| after how long do cracks occur |
|
Definition
|
|
Term
|
Definition
| of hydrogen absorption from the o-zone causing porosity |
|
|
Term
| what increases chances of cracking |
|
Definition
hard or thicker steel
- grater heat with slower travel |
|
|
Term
|
Definition
|
|
