987577
Descripción
Test por nixlourens, actualizado hace más de 1 año
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Creado por nixlourens
hace alrededor de 10 años
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Pregunta 1
Pregunta
When "Hydrogen Control" is specified for a manual metal arc welding project the electrode would normally be:
Respuesta
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Cellulosic
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Iron Oxide
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Acid
-
Basic
Pregunta 2
Pregunta
When "Hydrogen Control" is specified for a manual metal arc welding project the electrode would normally be:
Respuesta
-
Cellulosic
-
Iron Oxide
-
Acid
-
Basic
Pregunta 3
Pregunta
You would certainly recognize a hydrogen controlled flux electrode from its:
Respuesta
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Colour
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Length
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Trade Name
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BS639/AWS Code Letter
Pregunta 4
Pregunta
You notice manual metal arc electrodes are being, stripped of flux, are being used as a filler metal wire for TIG welding. You would object because:
Respuesta
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It is too expensive
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The wire would be too thick
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The metal composition may be wrong
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The wire is too short
Pregunta 5
Pregunta
For open site manual metal welding the following equipment is available. Which would you choose for safe site working?
Respuesta
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Single operator transformer
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multi-operator transformer
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AC/DC composition power unit
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Diesel engine driven motor generator
Pregunta 6
Pregunta
In MMA welding what parameter is used for control of penetration into the base metal?
Respuesta
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Voltage
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Welding speed
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iron powders in the coating
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Current
Pregunta 7
Pregunta
What type of characteristic is required for manual welding?
Respuesta
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Constant voltage
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flat characteristic
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Drooping characteristic
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DC generator
Pregunta 8
Pregunta
The weld metal deposit for MMA electrodes achieves its mechanical strength through:
Respuesta
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The core wire
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The flux coating
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Iron powders with the flux coating
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None of the above
Pregunta 9
Pregunta
What constituent is needed in the coating of an electrode to prevent the formation of porosity in the welding of a rimming steel?
Respuesta
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Iron powders
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Calcium florid
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Silicon
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calcium carbonate
Pregunta 10
Pregunta
Cellulose electrodes are often used when welding the root pass of pipes in the field because:
Respuesta
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Hydrogen control is needed
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There are iron powders in the electrode
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Higher arc voltage can be obtained
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Shorter arc length can be obtained
Pregunta 11
Pregunta
MMA electrodes can be grouped into three main types:
Respuesta
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Basic, cellulose and rutile
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Neutral, cellulose and rutile
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None of the above
Pregunta 12
Pregunta
Movement of the arc in MMA welding by magnetic forces is called:
Respuesta
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Arc deviation
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Arc misalignment
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Arc blow
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Arc eye
Pregunta 13
Pregunta
Which of the following coatings is associated with welding?
Respuesta
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Rutile
-
Cellulose
-
Basic
-
Oxodizing
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A,B,C
Pregunta 14
Pregunta
The voltage necessary to maintain an arc during metal arc welding is termed:
Respuesta
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Main supply voltage
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arc current
-
Arc Voltage
-
Open circuit voltage
Pregunta 15
Pregunta
When MMA welding low carbon steel which electrode which electrode will give the greatest deposition rate?
Respuesta
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Hydrogen controlled
-
cellulose
-
rutile
-
Iron powder
Pregunta 16
Pregunta
Hydrogen controlled electrodes were developed principally for:
Respuesta
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The prevention of porosity
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The prevention of cracking
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The enhancement of arc voltage
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There ease of arc starting
Pregunta 17
Pregunta
A basic electrode would normally:
Respuesta
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Have superior mechanical properties
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Require baking before use
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Not to be used on low carbon steels
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Both A and B
Pregunta 18
Pregunta
MMA welding of low alloy steels is more likely to be performed with:
Respuesta
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Rutile electrodes
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Cellulose electrodes
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Iron powder electrodes
-
Basic hydrogen controlled electrodes
Pregunta 19
Pregunta
When manual metal arc welding low carbon steel, which electrode covering will give the greatest degree of penetration?
Respuesta
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Iron powder
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Rutile
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Cellulose
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Low hydrogen
Pregunta 20
Pregunta
MMA welds made with damaged electrode coatings are subject to:
Respuesta
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Porosity
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Undercut
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Excessive penetration
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Excessive bead hieght
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