987577
Descrição
Criado por nixlourens
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Criado por nixlourens
mais de 12 anos atrás
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|
Questão 1
Questão
When "Hydrogen Control" is specified for a manual metal arc welding project the electrode would normally be:
Responda
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Cellulosic
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Iron Oxide
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Acid
-
Basic
Questão 2
Questão
When "Hydrogen Control" is specified for a manual metal arc welding project the electrode would normally be:
Responda
-
Cellulosic
-
Iron Oxide
-
Acid
-
Basic
Questão 3
Questão
You would certainly recognize a hydrogen controlled flux electrode from its:
Responda
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Colour
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Length
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Trade Name
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BS639/AWS Code Letter
Questão 4
Questão
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:
Responda
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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
Questão 5
Questão
For open site manual metal welding the following equipment is available. Which would you choose for safe site working?
Responda
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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
Questão 6
Questão
In MMA welding what parameter is used for control of penetration into the base metal?
Responda
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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
Questão 7
Questão
What type of characteristic is required for manual welding?
Responda
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Constant voltage
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flat characteristic
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Drooping characteristic
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DC generator
Questão 8
Questão
The weld metal deposit for MMA electrodes achieves its mechanical strength through:
Responda
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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
Questão 9
Questão
What constituent is needed in the coating of an electrode to prevent the formation of porosity in the welding of a rimming steel?
Responda
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Iron powders
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Calcium florid
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Silicon
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calcium carbonate
Questão 10
Questão
Cellulose electrodes are often used when welding the root pass of pipes in the field because:
Responda
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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
Questão 11
Questão
MMA electrodes can be grouped into three main types:
Responda
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Basic, cellulose and rutile
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Neutral, cellulose and rutile
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None of the above
Questão 12
Questão
Movement of the arc in MMA welding by magnetic forces is called:
Responda
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Arc deviation
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Arc misalignment
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Arc blow
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Arc eye
Questão 13
Questão
Which of the following coatings is associated with welding?
Responda
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Rutile
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Cellulose
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Basic
-
Oxodizing
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A,B,C
Questão 14
Questão
The voltage necessary to maintain an arc during metal arc welding is termed:
Responda
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Main supply voltage
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arc current
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Arc Voltage
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Open circuit voltage
Questão 15
Questão
When MMA welding low carbon steel which electrode which electrode will give the greatest deposition rate?
Responda
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Hydrogen controlled
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cellulose
-
rutile
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Iron powder
Questão 16
Questão
Hydrogen controlled electrodes were developed principally for:
Responda
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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
Questão 17
Questão
A basic electrode would normally:
Responda
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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
Questão 18
Questão
MMA welding of low alloy steels is more likely to be performed with:
Responda
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Rutile electrodes
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Cellulose electrodes
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Iron powder electrodes
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Basic hydrogen controlled electrodes
Questão 19
Questão
When manual metal arc welding low carbon steel, which electrode covering will give the greatest degree of penetration?
Responda
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Iron powder
-
Rutile
-
Cellulose
-
Low hydrogen
Questão 20
Questão
MMA welds made with damaged electrode coatings are subject to:
Responda
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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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