. The railroad and engineering journal . Fig. 128. or welt—which is shaded black in the engraving—on one or bothsides. In some cases a single well or covering strip, b, fig. used with either two or four rows of rivets. Such a seam hasno more strength than a lap seam like those shown by figs. iiSor 126. In fact, it consists of two lap seams. The circumfer-. Fig. 129. ential seams of boilers are, however, often made in this way inEurope, so as to get all the plates in the cylindrical part of theboiler flush with each other. Question 217. What is the strength of butt seams or jointscompare
. The railroad and engineering journal . Fig. 128. or welt—which is shaded black in the engraving—on one or bothsides. In some cases a single well or covering strip, b, fig. used with either two or four rows of rivets. Such a seam hasno more strength than a lap seam like those shown by figs. iiSor 126. In fact, it consists of two lap seams. The circumfer-. Fig. 129. ential seams of boilers are, however, often made in this way inEurope, so as to get all the plates in the cylindrical part of theboiler flush with each other. Question 217. What is the strength of butt seams or jointscompared with those rvhich have been described ? Annver. .\ butt seam with double strips and quadruple rowsof rivets is little, if any, stronger than a double-riveted lap seamproperly proportioned. The resistance to the crushing actionof the rivets limits the strength of both kinds of seams, and inthat respect they may be nearly equally strong. _, Question 218. IVAat advantages have butt seams with doublewelts, as shown in Jig. 12y .■ Answer. Such seams are often used for the longitudinalseams of boilers because a lap seam like that shown in fig. 130,when subjected to a tensile strain, will tend to draw into theform shown in fig. 131 —that is, the tendency is to drawinto a straight line, and a bending strain will be onthem at n and /. This strain al
Size: 1426px × 1753px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
