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62 Cards in this Set
- Front
- Back
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What are the five standard grades of stainless steel |
302, 316, 301, 430, 304 |
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What is Type 302 stainless |
18 chromium 8 nickel, excellent all-purpose stainless steel, excellent work ability and good resistance qualities |
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What is Type 302 stainless used for |
302 is used for the majority of work produced in the sheet metal shop |
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What is tape 316 stainless |
18 chromium 12 nickel, molybdenum improves the corrosion resistance especially we're pitting is a problem |
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What is Type 3 116 is used for |
Type 3 1-6 is used for photographic textiles chemical and paper industry equipment also storefronts and signs that will be exposed to Marine atmosphere , widely used in the dairy industry |
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What is Type 301 stainless |
17 chromium 7 nickel, adjusted to give the best combination of strength and workability an excellent corrosion resistance similar to type 302 |
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Where is type 301 stainless used |
For roof drainage and other interior or exterior applications where Extra Strength is needed |
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What is Type 430 stainless |
17 chromium,magnetic, with no nickel it is less workable than type 302 it is an economical grade that has a very good resistance to heat and corrosion |
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What is Type 430 stainless most commonly used for |
Kick plates, wagons and push carts |
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What is Type 304 stainless |
18 chromium 8 nickel, general purpose alloy, having better corrosion resistance than type 302 due to controlled carbon content |
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What is Type 304 stainless most commonly used for |
Chemical handling equipment, textile dying equipment, coffee urns, soda fountains |
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What is a number 1 finish |
A white pickled finish to use largely for industrial applications and products where surface finish is not important |
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What is the number 2B finish |
A bright smooth cold-rolled finish that can be shop polished to hire finishes, more easily polished than a number 2D, b stands for bright, d stands for dull |
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What is a number three polish |
An intermediate polished finish created with coarser abrasives the number 4, bright and uniform surface suitable for many jobs, not common in this area |
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What is a number 4 polish |
General-purpose polished finish most widely used for restaurant and kitchen equipment storefronts and hospital equipment, uniform bright finish produced with about a 150 to 180 abrasives .Satin finish on one side |
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What is a number 6 polish |
Produced by Tampico brushing a number 4 polish, a reasonable duplication of number six polish can be obtained by Tampico brushing number 2B finish with a fine abrasive and oil |
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What is the number 7 polish |
Reflective hi-lustre surface approaches that of a mirror, is a finely ground surface buffed to a high finish |
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What is important to remember when shearing or cutting stainless steel sheets where surface finish is important |
Protective paper should be used, the Finish surface of the stainless should always be turned up, and the sheet itself should be raised and slid across the bench on its Edge to prevent marring |
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What is the general capacity of a Shear for type 302 stainless compared to that of mild Steel |
50 to 75% of its capacity for shearing mild Steel |
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How should stainless sheets be properly stored |
In cases on their sides wherever possible, avoid sliding sheets over one another and handle carefully to prevent buckling |
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What maintenance must be done on rotary shears for efficient operation |
Cutter blades must be kept sharp and closely adjusted |
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What gauges of stainless can be cut using hand snips |
About 20 gauge and lighter without difficulty |
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What other hand tool works well for cutting stainless |
Nibblers |
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What should be done with the stainless after a fresh cut |
It should be filed to prevent scratching of adjacent sheets and cutting hands |
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How many teeth per inch for cutting stainless with a hacksaw or bandsaw |
32 teeth per inch |
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What type of Hacksaw blades are most suitable for cutting stainless |
High carbon and high-speed hacksaw blades |
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When bandsawing what is necessary for efficient cutting |
High speed blades with the correct pitch |
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What is the capacity of the tool for stainless steel on brake presses and standard hand brakes |
4 gauge is less than that of mild steel sheets |
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Why must proper allowances for springback be made when forming stainless steel |
Because of its high strength and metal deformation in forming |
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What must be done when both a Tight Seal and strengths are necessary in a joint |
The Joint should be lock seemed or riveted and then soldered to seal the seam |
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When should pure tin be used for soldering |
When the fitting is used as a food container and tinning of the complete item is necessary |
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What should be used for standard soldering jobs in stainless steel |
50/50 solder or Lloyds flux |
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For punching and Perforating how much power should be used |
Up to twice the power used for mild Steel and press speeds should be reduced by half or 50% |
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What could happen to the stainless if tools are not kept Sharp and closely adjusted |
The metal will tend to draw and work Harden increasing strain on tools |
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What is the minimum hole diameter when punching |
Hole diameter should not be less than about twice the sheet thickness |
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When Drilling stainless what should the drill tip be ground to |
130 to 140 degrees included angle |
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What should be used when drilling stainless |
A coolant such as oil whenever possible for heavy work of sulfurized oil such as sulfo should be used |
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When drilling light gauge stainless what should be used |
A backup plate of iron or plain Steel to to cut all the way through the material and prevent buring on the underside and possible drill breakage |
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What three rules should be observed when tapping |
Keep tabs sharp at all times, keep tabs well-lubricated with heavy oil, and Taps may be modified by those with enough experience |
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When riveting stainless steel a 1/4" inch diameter may be driven cold but what must be done |
Because they work hard and very rapidly they must be headed with one or two heavy blows |
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If riveting over a quarter inch in diameter what must be done |
Rivets should be heated to between 1950 and 2050 degrees Fahrenheit and headed as quickly as possible |
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What type of rivets can be driven cold up to 3/8 in diameter |
Pure chromium rivets |
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What temperature should larger chromium rivets not be heated above |
1550 degrees Fahrenheit |
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What are the two categories that classify the Alloys in aluminum |
Heat treatable Alloys and non heat treatable alloys |
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What numbers classify the non heat treatable alloys in aluminum |
1000, 3000, 4000, or 5000 series |
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What does the H series of tempers signify |
Further strengthening of the aluminum made by cold working the aluminum |
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In heat treatable alloys the initial strength of Alloys in this group is enhanced by what |
The addition of alloying elements such as copper magnesium zinc and silicon |
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What are the numbers designated to the heat treatable alloys |
2000 6000 and 7000 series |
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What does the T Series signify |
Thermal treatment for strengthening |
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What is 1000 series aluminum |
99% pure aluminum unalloyed, highly corrosion-resistant, low strength, workable, non heat treatable |
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What is 2000 series aluminum |
Contains copper as the alloy, gives strength, hardness, machinability is heat treatable |
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What is 3000 aluminum |
Contains manganese, moderate strength, good workability, non heat treatable |
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What is 5000 series |
Contains magnesium, moderate-to-high strength, corrosion-resistant, non heat treatable |
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What is 6000 series |
Magnesium and silicon, increases strength, formability, corrosion resistance, is heat treatable |
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What is 7000 series |
Contain zinc, for greatest strength, and is heat treatable |
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What series Alloys have good welding characteristics and corrosion resistance |
1000, 3000, 5000, and 6000 |
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What are the advantages and disadvantages of 2000 + 7000 alloys |
They have higher strength and better machinability but have lower weldability and corrosion resistance |
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What raw material is aluminum made from |
Bauxite |
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What is the melting point of aluminum |
659 Celsius or 1220 Fahrenheit |
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What are the characteristics have a good gas shielding and cleaning when welding |
A bright clean bead and bright HAZ border |
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What will create a dull grey Haz |
Poor gas Shield, too much Arc Length, unstable Arc, and low welding current |
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How is aluminum produced |
Through an electrolytic process |
