SOLDERING

Manawatu Times, Volume LII, Issue 3542, 25 February 1927, Page 4

SOLDERING

To those who build their own, it cannot be too strongly impressed if efficient and quiet operation is desired in the finished product, all soldered joints must bo securely made. Probably the highest percentage of “sicknesses” developed by the home-con-structed sets are due to poor soldering. In many instances tho primal cause is due to tho iron being cold. To secure the best success theiron must be hot. Most constructor* now use the easily procured solder in which a flux is already combined with the metal, with the result, when ths solder is applied to the joint the flux does its portion of the work at the same time. However, should the iron not he hot enough, a joint may be made and the solder, Instead of having a clean appearance, may show a slightly crystalline structure;, If such occurs resolder with greater heat applied. Where flux is used, resin is recommended (in fact, It is not too much to say that It should be the only flux for this work). It may sometimes happen that with an Iron on the cool side the resin will make a joint apparently strong, but which electrically Is poor. Again a real hot iron means that with a quickly-soldered joint the “heat” does not spread, and consequently connections made to transformer terminals do not tend then to weaken the connection where the fine wire from the winding Is made to the terminal also. If this latter occurs through too long an application an open circuit may occur which will bo hard to rectify,