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15 Cards in this Set
- Front
- Back
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How can the output of a single control DC generator welding machine be changed?
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By changing the brush positions.
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When welding with reverse polarity how should you set up the ground?
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from the negative pole to the work
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What arrangement of current and polarity results in the greatest concentration of heat at the electrode side of the arc?
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Direct current- reverse polarity
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Which conditions can cause arc spatter?
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Arc blow and poor welding technique
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What factor determines the size of the welding cable to be used on a particular job?
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The distance from the machine to the work.
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When arc welding on a naval ship what could be the result?
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electrolytical corrosion
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When welding on a shaft chucked up in a lathe what should you do to prevent arcing across the piece?
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Attach the ground directly to the piece
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Using an electrode holder that is to small for arc welding could cause what?
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The holder to overheat
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Why should you use a coating on arc welding electrodes?
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to improve the stability of the arc.
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What is the first step in starting an arc by the striking method?
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hold the electrode at a right angle to the work
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if an electrode is classified as 7018 what does the 1 stand for?
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welding position
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When reatarting an electrode at which point of the crater should you strike the arc?
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the cold end
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Plates up to what thickness can be welded without edge prep?
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1/4 inch
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when making a butt weld in the flat position why would you use a backing strip?
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to reinforce the weld
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arc blow is generally caused by what?
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electromagnetic forces
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