After the first weld was made any imperfections were then ground and re-welded which then following that the specimen was turned over the backside prepared for welding as well by grinding till clean fresh metal was seen in thoroughly inspecting to make sure no foreign material was present. After the material was re-prepped the next weld was made once the weld was complete it was inspected making sure no imperfections were in the test zone. Second specimen was prepared and welded in the same accord except this time the shielded metal arc welding process was utilized that was a 4043 electrode. The same steps were followed as before, the weld was made material was then turned over re-prepped till clean metal was seen and rewelded again and inspected for any imperfections in the test zone. After both specimens were welded there were then laid out, cut, ground, and overall prepared for the tensile testing machine. Roughly a 2 ½ inch long section was marked out, the very center of this section was measured marked/cut for three quarters of an inch wide and a slow taper into a radius from this point began and ended an inch and a quarter away from the centerline. Once both sides of the metal were prepped in this fashion the last 2 ½ inches or ground flat so that the diamond plate did not affect the clamping force of the tensile testing machine.
The first specimen tested was the one conducted with the wire feed utilizing the 1100 series electrode. The elongation was 15.42%, the KRS measured for the ultimate tensile strength was 15.9 KSI. The second specimen tested was the one conducted with the shielded metal arc welding process utilizing the 4043 series electrode. The elongation was 5.8%, the KSI measured for the ultimate tensile strength was 15.6 KSI. Looking at the 3000 aluminum series specifications states that the KSI for tensile strength should be somewhere between 13.7-19.5 KSI, the ultimate tensile strength are both specimens reaching 15.6 and 15.9 KSI is well above the minimum but below the maximum.
You've reached the end of your free preview.
Want to read all 3 pages?
- Spring '19
- Arc welding, Weld, ksi, Gas metal arc welding