232 



THE APPLICATION OF ELECTRIC WELDING 



than could otherwise have been employed to advantage. It is "hoped that the advent of auto^ 

 matic welding machines, feeding wire from reels at a rapid rate, will permit using high cur- 

 rents and high current densities, and of obtaining the better mechanical characteristics ac- 

 companying these higher values. 



♦'he following table sets forth the average; for the three groups employing (A) high- 

 est; (B) intermediate; and (C) lowest current densities: — 



The reason underlying the extremely definite indications as regards the quality of the 

 welds when studied as a function of the welding current and the relative vagueness of the in- 

 dications when an attempt is made to study the influence of the current density, is that the for- 

 mer, as regards its influence, is the dominating variable, while the latter is on a par with 

 many other minor variables and judgment as regards the influence of the current density in 

 the electrode, should be reserved until suitable researcli work is completed in which, with con- 

 stant current, different cross-sections of electrodes are employed. 



SIDE PLATING AND INTERNAL WORK. 



Full ivelds. — Outside edges of shell overlaps. Butts of shell plates and longitudinals. 

 Connection of transverse plates to shell clips. Connection of transverse to inner bottom plating. 



Light welds- 



-Inside edges of shell overlaps. 



DECK AND INTERNAL WORK. 



Full zy^Zrfj.— Seams of deck plating. Butts of deck plating and longitudinals. Heel of 

 gvmwale bar. Connection of beam to transverse. 



Light ivelds. — Connection of transverse beams plates to clips already on deck. Pillar and 

 detail work. 



The same remarks apply in regard to the filling of service holes. 



In conclusion I would like to add that it will give me pleasure to add details of the vari- 

 ous parts showing the kind of weld and the service holes required, so, if the Society thinks fit, 

 they can be added to Mr. Cox's paper. 



Lieutenant Commander H. G. Knox, Member: — I received a copy of this very inter- 

 esting paper late last night, and only had an opportunity to look it over hurriedly on the 

 train this morning. 



It appears to me that one of the conditions of the art of welding to-day is in effect that arc 



