Autogenous welding and cutting by Kautny Theodore & Whiteford James Forbes

Author:Kautny, Theodore & Whiteford, James Forbes
Language: eng
Format: epub
Tags: Welding
Publisher: New York [etc.] McGraw-Hill book company, inc.
Published: 1915-03-25T05:00:00+00:00

to each other, but, when the two sheets are heated to unequal temperatures, a straining of the rivets will occur, since they pass from a parallel to a converging position.

Further while the boiler is in service the inner surface of the fire tubes will remain of nearly equal temperature so long as the fire door is kept closed, but each time the door is opened a cold air current will enter the fire tube and cause the material to cool down and shrink. These fluctuations of temperature impose considerable strains upon the material, but particularly upon the rivets.

It is apparent therefore that the rivet holes must eventually become oval shaped and permit the water to enter the unoccupied space causing a corrosion of the material, which defects finally assume such proportions that the boiler has to be taken out of service.

Change of Methods. — As other methods of joining sheets were unknown, in the beginning of the boiler making industry, it was necessary to employ rivetting notwithstanding these defects. The process has been so developed and perfected that it will now be rather difficult, if at all possible, to replace the rivetting of boilers by autogenous welding.

When a method of examining an autogenous welding seam has been devised by which the quality of the seam can be reliably determined without injuring the metal, it is probable that the welding process will be more generally employed in the construction of boilers.

For the present, however, such welding method furnishes an economical and reliable means of repairing the corrosions and fractures which occur in boilers, during their use.

To repair worn rivet holes, the adjacent rivets must be removed for a distance of from 300 m/m to 500

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