Track Roller welding
Speaking of track roller welding, there are two common methods-conventional welding and friction. The image below is about the direct difference between these two welding methods in appearance.
Friction Welding is a solid state welding process in
which actual melting of the base metal does not take
place. In this type one part is stationary while the other
rotates against it. This causes rubbing action generating
friction and in turn leading to the generation of heat.
Localized plastic deformation takes place and the two
parts get welded.
Friction Stir welding is a solid state welding technology that allows two components to be joined without melting the parent metal. To create friction, the tool is spun against the workpiece. The native metal properties are not altered. For aluminium alloys and large workpieces, it's a popular choice. Porosity, solute redistribution, and cracking are not issues with this method. The defect concentration is minimal.
MIG Welding: This is a welding process in which an electric arc is
struck between the work-piece and the electrode. A
shielding gas is used to protect the piece from
contaminants. The electrode melts and acts as a filler
material to weld the two components. MIG welding is
considered one of the most versatile welding. It can be
used to join many types of different metals and welding
is also possible in various directions. Weld can be
performed by creating a butt joint, lap joint, edge joint
and T-joint. Different shielding gases are used
depending on the metal to be welded. Aluminium, mild
steel and alloy metals are welded by using an argon-CO2
blend. It is considered a semi-automatic process as the
electrical characteristics of the arc are automatically
controlled and the travel speed and gun position are
manually controlled.
Here is the conclusion of this study:
CONCLUSIONS
1. The tensile strength in FSW is much greater than that
in MIG welded joints as shown in table no 2. The
ductility for FSW welded joints is also greater.
2. The hardness profile graph shows that there is a
general decay of mechanical properties in the welded
joint. In case of FSW there is a decay of properties in
HAZ and the hardness value differs in different zones.
3. From fig no.6, 7 we can conclude that the
microstructure of FSW welded specimen has equi-axed
grains those results in better tensile strength as
compared to those in MIG welded joints showing
dendrite structure.
Thus we can conclude that FSW is a preferred process
over MIG welding as it saves energy, does not show any
fusion related problems and is cost effective.
