Specifications

78
Soldering: For soldering, electric irons are generally used on small armatures and gas irons on
the larger ones. The size of the iron used depends on the size of the commutator. Leads are
soldered to the commutator by means of soldering iron or torch. The procedure of soldering is
as follows.
First the soldering flux is applied over the wires to be soldered and also the identified
commutator raiser. The wires are then laced in the respective raisers. Then the tip of the soldering
iron is kept on the commutator raiser as shown in Fig. 6.8, for sometime until the heat from the
iron is transferred to the area of the commutator raiser.
This heat transfer could be identified by the bubbling of the flux. When the commutator
raiser is sufficiently hot, the solder is placed on the commutator raiser, and the iron is kept over
it and the solder is allowed to flow entirely around the leads.
Fig. 6.8
Fig. 6.9
To prevent the solder from flowing down the back of the commutator and thereby causing
short circuits, raise one end of the armature. To prevent the solder from flowing from one bar to
another, the iron is held as shown in Fig.6.9. Excess flux is wiped out after the soldering is
completed.