Welding: Principles and Applications
This comprehensive welding text covers all aspects of welding, progressively guiding them from the absolute basics to AWS Certified Welder Test preparation. Experiments and practices are designed to familiarize the student with a wide range of machine settings, production of quality welds, while minimizing wasted stock and nonskilled work such as grinding and finishing.Based on standards established by the American Welding Society, the student learns to develop industry-acceptable practices for professional application.
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in fig 3.13
Backward arc blow tends to occur when welding in a direction towards the
current return connection, or earth connection, and forward arc blow whenwelding in the other direction. As it is likely to be easier to control a
backward deflecting arc than a forward deflecting one during MMA welding,
it is usually better to weld towards the return or earth connections. Use of
multiple earth connections may solve the problem altogether.