222 THE APPLICATION OF ELECTRIC WELDING 



Intermediate values may be obtained by direct interpolation, and for thick- 

 nesses below 0.40 the throat thickness is to be about 70 per cent of the thickness of 

 the plate. 



13. A "full weld'' extends from the edge of a plate for a distance equal to the 

 thickness of plate to be attached, and the minimum measurement from the inner 

 edge of plate to the surface of weld is the throat thickness given in the table above. 



14. A "light closing weld" is a single run of light welding worked continuously 

 along the edge of the plate. Such a weld may, however, be interrupted where it 

 crosses the connection of another member of the structure. 



15. An "intermittent or tack weld" has short lengths of weld which are spaced 

 three times the length of the weld from center to center of each short length of weld. 

 Such tack welding may vary in amount of weld between a "full weld" and a "light 

 closing weld." 



16. The general character of welds is to be in accordance with the following 

 table : — 



Inside edge Outside edge 



(a) Butts of shell, deck and inner bottom plating ....)„ 



(b) Butts of longitudinal girders and hatch coamings j 



(c) Edges of shell, deck and inner bottom platmg ) j 



(d) Butts and edges of bulkhead plating [ 



Toe Heel 



(e) Frames to shell, reverse frames to frames and floors . . 



(/) Beams to decks 



(g) Longitudinal continuous angles Vy j 



(h) Side girders, bars to shell, intercostal plates, floors and 



inner bottom 



(i) Bulkhead stiffeners 



F = Full weld. L = Light weld. T = Tack weld. 



17. All bars required to be watertight are to have continuous welding on both 

 flanges with tack welding at heel of bar. 



18. The welded connections of beam, frame and other brackets are to be sub- 

 mitted for special consideration. 



19. The committee may require, when considered necessary, additional attach- 

 ment beyond that specified above, and the welding of all other parts is to be to their 

 approval. 



The rules are necessarily of a tentative nature and general in character and will 

 be modified as further experience demands. It will be observed, however, that con- 

 siderable importance is attached to the system of welding, type and process of manu- 

 facture of electrode, and to the employment of specially trained operators under su- 

 pervisors of proved ability. 



