Unitized Structural Body Repair Questions and Answers
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Course
Michigan mechanic
Institution
Michigan Mechanic
Unitized Structural Body Repair Questions and Answers
Unibody
Lightweight stamped sheet metal components that are welded to each other to create a single unit.
Space Frame
Body panels can be made from plastic are steel. Steel may be Mild, Intermediate, or HSS. Panels may hide damage to fr...
Unitized Structural Body Repair
Questions and Answers
Unibody - answer Lightweight stamped sheet metal components that are welded to
each other to create a single unit.
Space Frame - answer Body panels can be made from plastic are steel. Steel may be
Mild, Intermediate, or HSS. Panels may hide damage to frame or structure.
Crush Zones - answerStructural components such as rails are designed to collapse and
bend at specific points.
Collision Energy Management - answerGoal is passenger protection. Front and rear
structures act as crush-able energy absorbers.
Direct Damage - answerPOI. Easily located and diagnosed.
Indirect Damage - answertransmission of collision energy beyond the area of immediate
impact. Examples; Split seam sealers, pulled spot welds, misaligned panels, buckles in
steel, cracked glass, and cracked or chipped paint.
Passive Restraint Systems - answerMust have service manual. No two are alike.
Datum - answerImaginary plane or line beneath the vehicle. Measures height.
Centerline - answerVertical plane that passes from the front of the vehicle to the rear.
Measures Width. May have stamped marks on vehicle body structure. Is confirmed by
referencing at last 3 width measurements in the undamaged portion of the vehicle.
Zero Planes - answerVertical plane that passes from side to side. Confirmed by
measuring 3 length measurements from the undamaged portion of the vehicle.
Symmetry - answerEqual on each side of the vehicle.
Asymmetrical - answerUnequal on each side of the vehicle. (spare tire well)
Reference Points - answerBolts or nuts, Holes, Mechanical attachment points, Edges of
panels, Door strikers, Corner of openings. Common tolerance is =/.3mm (1/8) or all the
way to 1mm (1.32).
, Loaded Measurements - answerDrivetrain In
Unloaded Measurements - answerDrivetrain out
Point to Point Measurements - answershortest distance between 2 reference points.
AKA "as the crow flies". Uses tram or steel tape measure.
Datum Measurements - answerTaken at Datum plane, height differences between
reference points. Laser measuring system
Computerized Measuring System - answercompare data stored in a software program
or a central database. Get hard copy of measurements. Can watch while pulling.
Steel - answerCannot know what kind by visible. Must check service manual.
Tensile Strength - answerAmount of pressure/force necessary to fracture or tear steel.
Yield Strength - answerAmount of force/pressure necessary to deform steel
permanently.
PSI - answerPounds per inch /// tensile and yield strengths are expressed. Higher the
number the stronger the steel.
Mild Steel - answerCosmetic, used on Space frames, May be stressed relieved with
heat, tears can be welded without a loss of strength. Yield strength 30,000 PSI
Intermediate Steel - answerYield strength 30,000-70,000 PSI, structural and cosmetic,
may be affected by excessive heat, small tears can be welded w/o loss of strength.
High Strength Steel (HSS) - answerYield strength between 30,000-100,000 PSI, used in
cosmetic and structural, is destroyed by exceeding temperature or time limits, should be
replaced if kinked or torn excess of 1/4 inch, should be straightened cold whenever
possible.
Ultra High Strength Steel (UHSS) - answerVery high yield strength exceeding 100,000
PSI, must never be repaired, door intrusion beams and re-bars.
MIG/GMAW Welding - answer
Stick-Arc, and Oxy-Acetylene - answerAre not recommended for unibody repair. They
heat up to large of an area that is not needed. you want to weld the smallest area
possible.
Compression Spot Welding - answerUsed by manufactures, but is not recommended for
collision repair. Our equipment makes welds 70-80%of the strength of manufactures.
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