IV. ULTRASONIC TESTING 



Hull number two was completely tested by the ultrasonic 

 method. A numtber of small flaws in the welds were located, 

 most of which were in the insert welds. These flaws were 

 believed to be welding cracks and slag accumulations in the 

 insert welds . 



V. PRESENTATION OF DATA 



The data is presented in the same form as received from 

 the computer, Sigma 1 is the principal stress in the leg 1 

 direction and sigma 2 is the principal stress 90° to sigma 1. 

 Sens 1 and Sens 2 are the strains j respectiveh/j to sigma 1 

 and sigma 2. 



It is assumed that either leg 1 or 2 is on the principal 

 stress line on two gage rosettes. The plot of the data which 

 is reproduced below the data listing has sigma 1 as the abscissa 

 and pressure as the ordinate. 



The gage locations can be determined from Figure 1. The 

 nomenclature of the numbering system was as follows: The . 

 last number or numbers signify gage locationj the middle 

 number indicates inside or outside -3 insidej 4 outside. The 

 first number is the area location identifier. Leg 1 is always 

 on the strain gage line. The strain gage line is either the line 



