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22 Cards in this Set
- Front
- Back
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The use of shielding gases when using wire feed processes increases the need for good? |
Ventilation |
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High ultraviolet radiation emissions from an open arc can cause atmospheric oxygen in the vicinity of the arc to convert to?? |
Ozone |
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Define and describe gmaw(mig) welding process |
GMAW is an arc welding process that uses an arc between a CONTINOUS FILLER METAL ELECTRODE AND WELD POOL. THE process uses shielding gas from an externally supplied source |
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GMAW (Mig) is recommended for use on which metals ?? There are 4 |
-stainless steel -aluminum -copper alloys -carbon and low allow steels |
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What are the operation principles of FCAW (fluxcored) |
FCAW uses an arc established between continously fed consumable electrode and the work piece. Appropriate settings made by the operator to maintain constant burn-off Rate of the wire electrode . Depending upon the power source and wire drive system used. Arc length is maintained automatically. SHIELDING GAS CAN BE EXTERNALLY APPLIED AND/OR OBTAINED FROM A FLUX contained within the hollow electrode core ( depending kn the type of Flux cored wire used) |
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Self shielded FCAW uses shielding gas generated from the ? |
Flux |
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What is the electrode extension (stick out ) range for self shielded FCAW |
3/4"(19mm) ------- 3-3/4"(95mm) |
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What are the 6 basic equipment components always required for the set-up of a wire feed outfit |
-power source -wire feeder -gun cable assembly -spooled filler wire -shielding gas -gas control equipment |
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How are wire feed guns rated? |
By current - carrying capacity |
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The major factor in choosing between an air-cooled or water cooled gin is the ? |
Required current/voltage |
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Welding power sources designed only for wire feed welding can only be used for SMAW True or false? |
False |
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GMAW may be used in semi-automatic or automatic operation modes? True or false? |
True |
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What type of welding power source is most often used for GMAW |
Constant voltage |
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Constant voltage machines produce a ? |
Relatively flat volt-amp curve |
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The power source best suited for the short circuit mode of metal transfer is |
Constant voltage power source |
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What type of volt amp curve does a constant current machine produce? |
Drooping |
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A welding machine that produces an aost horizontal output slope is a? |
Constant voltage machine |
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3 advantage of GMAW |
-lower skill requirement then SMAW -excellent for light gauge metals -good arc control when working with poor fit ups -less heat input which means less distortion -no slaw to remove or little to no post clean up required |
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3 dis advantages of GMAW |
-special equipment required resulting in higher initial cost -equipment requires more maintenence and down time -lack of fusion can be a problem -cannot be used outdoors or drafty areas -wire feeder must be in close proximity to welding -produces high radiant energy |
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What are the advantages of FCAW |
-The deposition Rate is up too 4x greater then SMAW -the visible are is easy to use -weld metal deposits are high quality |
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Dis advantages of FCAW |
-The equipment is more expensive to purchase then that needed for SMAW -More smoke and fumes are generated, which will require suitable exhaust removal system -wire feeder must be close approximately to the welding -Equipment is more complex then SMAW. which requires more maintenence |
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The powder is MCAW wire consists mostly of? |
Metal |
