Sheet Metal UPDATED ACTUAL Questions and CORRECT Answers
Question: Sheet ID
Correct Answer: -Along Grain of Metal -Alloy represented -Thickness -Heat Treatment
Question: Material thickness
Correct Answer: Thousands of an inch
Question: Sheet thickness
Correct Answer: .006-.249"
Question: Where to bend sheet
Correct Answer: 90° across grain
Question: Alclad
Correct Answer: Plated with pure aluminum
Question: Pure aluminum
Correct Answer: -Corrosion resistant -Tensile strength of aluminum 9,000 - 13,000 PSI -Oxidation when
hits air -More anodic
Question: Wrought
Correct Answer: -Rolled -Sheet,Plate,Structural
Question: Cast
Correct Answer: -Poured into mold -Heat treated or Non
Question: H and T designations
Correct Answer: -H= Work hardened -T= Heat Treated
Question: Aluminum alloy
Correct Answer: -2k and 7k heat treatable -Alloy elements 6-7% -5k and 6k weldable
Question: Aluminum Alloy Designations
Correct Answer: 1= None 2= Copper 3= Manganese 4= Silicon 5= Magnesium 6= Silicon and Magnesium
7= Zinc
Question: Caustic Soda and Silver Nitrate
Correct Answer: -Caustic soda turns copper black -Silver nitrate turns Magnesium black
Question: Steel Designation
Correct Answer: -First digit = Type of steel -Second digit = Percent of alloy -Third digit = Sometimes
percent -Last two = carbon content in point(hundredths of one percent)
Question: Stainless Steel
Correct Answer: -High chromium/nickel content -Common use is firewalls -Drill large angle slow
Question: Monel
, Correct Answer: nickel - copper -Cold work hardened -Weldable -Rivets for stainless steel
Question: Burnishing Sheet metal
Correct Answer: Pushing clad back into position
Question: Assembly with Rivet
Correct Answer: -Lap joint -Shear load -Weld breaks heat treatment -A/C structure made with HT al alloy
-Head on smaller sheet
Question: Joggle Joints
Correct Answer: -Depth based on thickness -Return length is from bend to bend -Stop contaminants from
collecting
Question: Rivets
Correct Answer: 470 - u-head rivet 426 - countersink 100 degree 430 - 144 degree sphere head
Question: Rivet Head Markings
Correct Answer: -1100=A -2117=AD dimple -2017=D Ice box raised dot -2024=DD Ice box double dash
-5056=B Raised cross -7050=E Ring
Question: Rivet Diameter and length(shop head)
Correct Answer: Shop head=Width 1.5D and length .5D Shop head= Mins 1.25D .33D Max 1.66D .66D
Question: Finding Rivet Diameter
Correct Answer: -Take thicker sheet multiply by 3 then multiple by 32 then round up -1/8th of OD tube
Question: Rivet Length
Correct Answer: -Grip length 1.5D + Sheet Thickness' added together -Too short sheets will buckle -Too
long sheets will separate
Question: Rivet Layout
Correct Answer: -Edge Distance=2D (+" preferred) -Rivet Pitch=3D -Transverse Pitch=2.5D
Question: Rule of Seven
Correct Answer: No. 3 - #40 No. 4 - #30 No. 5 - #20 No. 6 - #10
Question: Cleco Color
Correct Answer: No.3=Silver No.4=Copper No.5=Black No.6=Brass/Gold
Question: Precision Reamer
Correct Answer: -Turned only in cutting direction -Close tolerance cuts
Question: Rivet Gun
Correct Answer: -Power Usually 3 -Straight=Universal -Mushroom=Flush head and any countersunk
-Protruding=Different head for each style and diameter
Question: Bucking Bar
Correct Answer: One pound less of rivet power
Question: Failed Rivet Types
Question: Sheet ID
Correct Answer: -Along Grain of Metal -Alloy represented -Thickness -Heat Treatment
Question: Material thickness
Correct Answer: Thousands of an inch
Question: Sheet thickness
Correct Answer: .006-.249"
Question: Where to bend sheet
Correct Answer: 90° across grain
Question: Alclad
Correct Answer: Plated with pure aluminum
Question: Pure aluminum
Correct Answer: -Corrosion resistant -Tensile strength of aluminum 9,000 - 13,000 PSI -Oxidation when
hits air -More anodic
Question: Wrought
Correct Answer: -Rolled -Sheet,Plate,Structural
Question: Cast
Correct Answer: -Poured into mold -Heat treated or Non
Question: H and T designations
Correct Answer: -H= Work hardened -T= Heat Treated
Question: Aluminum alloy
Correct Answer: -2k and 7k heat treatable -Alloy elements 6-7% -5k and 6k weldable
Question: Aluminum Alloy Designations
Correct Answer: 1= None 2= Copper 3= Manganese 4= Silicon 5= Magnesium 6= Silicon and Magnesium
7= Zinc
Question: Caustic Soda and Silver Nitrate
Correct Answer: -Caustic soda turns copper black -Silver nitrate turns Magnesium black
Question: Steel Designation
Correct Answer: -First digit = Type of steel -Second digit = Percent of alloy -Third digit = Sometimes
percent -Last two = carbon content in point(hundredths of one percent)
Question: Stainless Steel
Correct Answer: -High chromium/nickel content -Common use is firewalls -Drill large angle slow
Question: Monel
, Correct Answer: nickel - copper -Cold work hardened -Weldable -Rivets for stainless steel
Question: Burnishing Sheet metal
Correct Answer: Pushing clad back into position
Question: Assembly with Rivet
Correct Answer: -Lap joint -Shear load -Weld breaks heat treatment -A/C structure made with HT al alloy
-Head on smaller sheet
Question: Joggle Joints
Correct Answer: -Depth based on thickness -Return length is from bend to bend -Stop contaminants from
collecting
Question: Rivets
Correct Answer: 470 - u-head rivet 426 - countersink 100 degree 430 - 144 degree sphere head
Question: Rivet Head Markings
Correct Answer: -1100=A -2117=AD dimple -2017=D Ice box raised dot -2024=DD Ice box double dash
-5056=B Raised cross -7050=E Ring
Question: Rivet Diameter and length(shop head)
Correct Answer: Shop head=Width 1.5D and length .5D Shop head= Mins 1.25D .33D Max 1.66D .66D
Question: Finding Rivet Diameter
Correct Answer: -Take thicker sheet multiply by 3 then multiple by 32 then round up -1/8th of OD tube
Question: Rivet Length
Correct Answer: -Grip length 1.5D + Sheet Thickness' added together -Too short sheets will buckle -Too
long sheets will separate
Question: Rivet Layout
Correct Answer: -Edge Distance=2D (+" preferred) -Rivet Pitch=3D -Transverse Pitch=2.5D
Question: Rule of Seven
Correct Answer: No. 3 - #40 No. 4 - #30 No. 5 - #20 No. 6 - #10
Question: Cleco Color
Correct Answer: No.3=Silver No.4=Copper No.5=Black No.6=Brass/Gold
Question: Precision Reamer
Correct Answer: -Turned only in cutting direction -Close tolerance cuts
Question: Rivet Gun
Correct Answer: -Power Usually 3 -Straight=Universal -Mushroom=Flush head and any countersunk
-Protruding=Different head for each style and diameter
Question: Bucking Bar
Correct Answer: One pound less of rivet power
Question: Failed Rivet Types
