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130 THE MARINE REVIEW. aeees © aan Sa, et \, NZ ered Butt Welded\; \\/P trom Wr5/1G, : 4 Hl LITE" Butt Stra Worked ae, t1side Taper FIG. 4 7 1 ae ae LOLDS. Contiivous Weld for LEngi/) of Litjer COSITITIVOUS Weld arourid Bulthead aye Cees pe (rales Bulkhead Piss We/d Tach Weld OUNnaary Arigle ene: see ian aes | ai O/7I700US Weld for LENGI/) OF Lirrer FIG. 6 FIG. 4—LAPS AND BUTTS IN THE SHELL PLATING. WHEN CONSTRUCTED ON THE CLINKER SYSTEM—FIG. 5—CLINKER SYSTEM SECTION AT CC OF FIG. 2 SHOWING METHOD OF WELDING AT THE LAP OF THE RULKHEAD PLATING—FIG. 6—CLINKER SYSTEM SECTION AT BB OF FIG. 2 SHOWING THE METHOD OF WELDING TAPERED LINERS AT THE LAP OF THE SHELL. PLATING a thin’ strip: over <the. joint and: a satisfactory result obtained. ‘To fit a double strap outside the ship (the practice before electric welding was introduced) would have involved much time and labor and would not have been satisfactory, causing a poor sur- face and joint. The reinforcement of badly pitted plates is another of the uses to which electric welding has been applied in ship repair during the present war. The construction of an electrically welded barge is shown in Fig. 1. The details. of this vessel. are similar to those of a riveted ship. The platcs were bolted up when the parts were assenibled, and after welding the bolts were removed and replaced by plugs ‘which were welded up flush with the plating. The plates, ete., are comparatively light and easy to weld, the only diffi- culty in the thin plates being that the plate may be grooved along the weld if the operator is not careful. The type of joint used in this con- struction was chosen with the pur- pose of making as much as_ possible of the welding horizontal, so as to Continuous We/d afovrid Bulkhead CONTINOUS FOL == LATE OF LIIET == render good work more easily obtain- able. We now come to two of the most interesting applications of electric welding to ship construction so far attempted in Great Britain which con- sist of experiments designed to show the relative merits of welded and riveted ship construction. The two ships, sections of which are shown in Bigss:2 ‘and, 5) had a portion. of “the side plating—on one side of each vessel only—electrically welded. The other side of each ship was riveted in the usual manner. In one case, as shown in Figs. 4, 5, 6, and 7, the plating was worked on the clinker system; in the other, as. shown in Bigs.) 9/107 and 11, on. the raised and sunken system. Ordinary ship construction was followed in both cases, and although the sketches do not show the most curved portion, the curvature of the shell is evident. “The shape of the shell and the restricted space between it and the longitudinal bulkhead rendered the work extremely difficult, and under more straightfor- ward conditions better results should be obtained if proper care is exercised. Continvous Weld aforng Insid and OOF Side of Lap L atae 7 ; Butt Welded from : | OvIs/de BUTT Strap | Referring first to the clinker system, it will be noted from Fig. 2 that the joint of the lapped edge is horizontal and made in the open by a continuous weld. Rivets with nonwatertight spacing were worked and an _ inter- mittent weld applied to the lower edge. If well made, such a joint is quite as good and almost as cheap as a double-riveted lap. The joints of the bulkhead plates are made similar- ly. Attention is called to the bulb stiffeners at CC and to the joints at BB and AA as illustrative of the diffi- culties that arise in.actual ship con- struction such as this. In Fig. 4 the butts of the - shell plating are indicated. The joints are between frames and the strap, which is 53% inches wide, is worked on the inside, connected by rivets with non- watertight spacing, and the butt welded from the outside. Such a joint, it well made, is quite as strong as a double-riveted single-butt strap, is slightly cheaper, and remains water- tight at greater loads—an important point often overlooked. Fig. 5 shows a section through the bulkhead lap. It is 6f interest, as it ROLD TKI NXIELE BU/D Angle FIG. 7—CLINKER SYSTEM AT SECTION AA OF FIG. 2 SHOWING THE METHOD OF WELDING THE TAPERED LINERS AT THE BULKHEAD LAP—FIG. 8— RAISED AND SUNKEN SYSTEM EXPANSION OF SHELL PLATING SHOWING LAPS AND BUTTS—FIG, 9—RAISED AND SUNKEN SYSTEM AND CONTINUOUS WELDS AT SECTION CC OF FIG. 2 SHOWING METHOD OF WELDING AT THE LAP OF THE BULKHEAD PLATING March, 1919 a 4 a 4 B a PE eee e eT Aes Th ge TS . ia Ee %