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Table 7-2.—Electrode Selection Guide electric-arc welding. The first two digits in the symbol The fourth digit of the symbol represents special designate the minimum allowable tensile strength in characteristics of the electrode, such as weld quality, thousands  of  pounds  per  square  inch  of  the  deposited type of current, and amount of penetration. The numbers weld metal. For example, the 60-series electrodes have range  from  0  through  8.  Since  the  welding  position  is a minimum tensile strength of 60,000 pounds per square dependent on the manufacturer’s characteristics of the inch,  while  the  70-series  electrodes  have  a  strength  of coating, the third and fourth numbers are often identified 70,000 pounds per square inch. together. The third digit of the symbol indicates the joint position for which the electrode is designed. Two num- Electrode Selection hers are used for this purpose: 1 and 2. Number 1 desig- nates an electrode that can be used for welding in any Several factors are critical when you choose an position. Number 2 represents an electrode restricted for electrode  for  welding.  The  welding  position  is  particu- welding in the horizontal and flat positions only. larly significant. Table 7-2 shows the recommended 7-7

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