Metalurgica 1000X

Josh Small & Daniel
Metallurgy’s
Eli Van Ringelenstein
Metallurgy’s Lab and UAA Library
Lab number #2
Aluminum Alloy 7075-T6
9/27/2012
Introduction-
Lab assignment number tworequires us to compare a material against its ASTMS/AISI specification, and mill reports (MTS). We were to check the minimum requirements in 2 inches of material in addition to also check the tensilestrength, reduction of area, and yield strength. Also we need to find the chemical composition, weldability, hardness (Brinell & Rockwell B-scale), and formability. The Instructions were as fallowed:Cut, or Shear a strip of the base material 14 inches in length and 1.5 inches in width, next mill out a section 2.5 inches in length and a width of 1 inch. The section tested should not be exposed tocooling or heating. Then mark the 14” specimen with the 2-inch center punch marks. On another section of the same material (Al 7075-T6) cut the 2.5-inch x 12-inch material in half and bevel thatsection. This piece we will weld back together with the proper filler metal. After welded we are to mill out a section just like on the other piece of metal.

Equipment-
-Brinell Hardness Machine- Rockwell Hardness B-scale
-Tension Test Machine
-TIG Welding Machine
-6” Aluminum grinder
-Band Saw
-Sand Blasting Machine

Safety Requirements-
-Safety Glasses
-WeldingGloves
-Welding Hood
-Face Shield

Welding Procedures-
The Aluminum alloy 7075-T6 can be classified as an “unweldable alloy,” however it can be done, but it is not recommended. It took us along time and a bit of research before we found a filler rod that would work on our material. The two filler rods that work for TIG welding on our material were ER4043 and ER4047. Since the TIG classdidn’t have any ER4047 filler rod, we decided to weld our two pieces of 7075-T6 Aluminum, 6” single v-groove back together with the ER4043 filler rod. After selecting our filler rod we set our TIG...