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29 Cards in this Set
- Front
- Back
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A ferrous metal has a high content of what? |
Iron |
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How would you describe a non ferrous metal? |
One that contains little or no iron and is usually non magnetic |
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A metal that is red or yellow colour is most likely what type of metal? |
Copper or brass |
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What's the normal colour for steels and cast irons ? |
Silver grey |
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If a metal that has fractured shows a dull grey colour, without bending before breaking then it's most likely what metal? |
Grey cast iron |
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In using a chip test to identify a metal what would a smooth continuous chip indicate ? |
A soft material like aluminium |
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How is cast iron distinguished from low carbon steel in a spark test? |
The Sparks given off by cast iron are short with red bursts near the grinder |
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How can using a new hand held file give you an estimate of the metals hardness? |
If the file bites into the metal easily then it's likely a soft meta |
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Describe the oxyfuel cutting process: |
A controlled process of rapid oxidization in which steel is heated to kindling temperature and a high pressure jet of pure oxygen is directed to the heated area. Metal exposed to the oxygen oxidizes and is blown away by the oxygen jet stream |
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Which ferrous based metals can't be cut well with an oxyfuel torch? |
Cast irons and stainless steels |
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The space created when a piece of metal is cut is called the: |
Kerf |
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On a combination cutting torch the oxygen valve on the torch handle must be: |
Fully open |
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The larger the orifices of a cutting tip, the: |
Thicker the plate that you can cut |
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Which metals can be readily cut using the oxyfuel cutting process? |
Mild steels |
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The ability of a metal to permanently deform under load without breaking is known as what? |
Ductility |
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The ultimate pull that a material can withstand is called what? |
Tensile strength |
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Dynamically loaded structures are subject too: |
Reversals of stresses |
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Which is the best example of a dynamically loaded structure? |
The boom on a crane making a lift and then swinging the load |
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Electrodes used in SMAW are often called what? |
Consumable electrodes |
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Electrode specifications are written by whom? |
CSA and AWS |
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In the AWS classification for SMAW mild steel electrodes what does the last digit represent? |
The major ingredient in the coating and recommended current for the best results |
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What do the first two digits in the AWS classification for carbon steel SMAW represent ? |
As welded minimum tensile strength |
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In the CSA numbering system for welding electrodes what does the prefix letter E represent ? |
Electrode |
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What is one characteristic of an E6010 electrode ? |
Deep penetration into the base metal |
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What is one purpose of the flux coating on a welding electrode? |
To protect the molten weld puddle from atmospheric contamination |
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What is one function of the slag produced from electrode coatings ? |
To prevent the weld from cooling too rapidly |
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What is the main purpose for keeping low hydrogen electrodes dry ? |
To minimize the possibility of hydrogen induced cracking |
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To weld thin materials you would likely select an electrode with: |
A small diameter core wire |
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Which electrode would be the best choice if he base metal properties were unknown ? |
E7018 |
