BLOG-7 STEEL RELATIVITY AND JOINTS

 

BLOG-7  STEEL PROPERTIES AND  JOINTS

The current flows from the positive (high end of the table) to the negative (low end of the table).

ANODIC            CATHODIC

GALVANIC ACTION – when two metals are in contact, the one that is higher

                                         in the galvanic series will become the anode and will

                                        corrode.

CO-EFFICIENT OF THERMAL EXPANSION:

                                       The changes in temperature causes expansion and

Contraction, these changes are quantified by co-efficients

Specific gravity:   Density of the  substance/ Density of water

Tensile/yield : the graphical representation of steel under pressure from

                          Deformation zone to failure or breakage of steel.                   

                          

                                       

                                           SOLID<-> LIQUID<-> GAS

Reflectivity- p(y) =Gr (y) / Gi (y)           

           P is the reflectivity.

           Y is the wavelength of the light.

           Gr is the reflected radiation

           Gi is the incident radiation.                    

 when a light beam encounters a material, radiation can be absorbed or reflected by the surface.

Oil canning – Visible waviness in the flat areas of metal roofing and metal

                           Wall panels. ELASTIC BUCKLING.

Prevention :    design – choice of material

                            Thicker/ high quality material

                            Light colored/ low gloss finish

                           Use of backer rod

                           Skilled workers

JOINTS

WELDING/SOLDERING

BOLTED:     Using nut and bolts with cover plates

 

 

PIN  :  A pin connection works essentially like a lapped joint

MECHANICAL FASTNERS

A device used to mechanically join or fasten two or more objects.

Non permanent joints

 

 

 

RIVET : The permanent joining of parts. Mainly used for fastening sheet and shaped rolled metal. Used in double cover plate joints.


Aircraft Construction, Riveted Joints (Part 1 of 2)


TOOL

STAINLESS STEEL

-martensitic

-austenitic

-PH

-Duplex

-Ferritic

CARBON

-High carbon steel

-medium carbon steel

-low carbon steel



                                                          -MUHAMMAD










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