Riveting.--Though stays will prevent the ends of the boiler blowing off,
it is very advisable to rivet them through the flanges to the ends of the
barrel, as this gives mutual support independently of soldering or brazing.
Proper boiler rivets should be procured, and annealed before use. Make the
rivet holes a good fit, and drill the two parts to be held together in one
operation, to ensure the holes being in line. Rivets will not close
properly if too long. Dies for closing the rivet heads may be bought for a
few pence.
Soldering, etc.--Joints not exposed directly to the furnace flames may be
soldered with a solder melting not below 350 degrees Fahr. Surfaces to be
riveted together should be "tinned" before riveting, to ensure the solder
getting a good hold afterwards. The solder should be sweated right through
the joint with a blow-lamp to make a satisfactory job.
All joints exposed to the flames should be silver-soldered, and other
joints as well if the working pressure is to exceed 50 lbs. to the square
inch. Silver-soldering requires the use of a powerful blow--lamp or
gas-jet; ordinary soft soldering bits and temperatures are ineffective.
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