Mechanical Engineering Exam > Mechanical Engineering Questions > Arc blow is more common ina)A.C. weldingb)D.C...
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Arc blow is more common in
- a)A.C. welding
- b)D.C. welding with straight polarity
- c)D.C. welding with bare electrode
- d)A.C. welding with bare electrode
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Arc blow is more common ina)A.C. weldingb)D.C. welding with straight p...
Understanding Arc Blow
Arc blow is a phenomenon that occurs during welding processes, leading to an unstable arc that can result in poor weld quality or difficulties in maintaining the arc.
Why Arc Blow is Common in D.C. Welding with Bare Electrode
Arc blow is particularly prevalent in D.C. welding with bare electrodes due to several factors:
Conclusion
In summary, arc blow is more common in D.C. welding with bare electrodes due to the strong magnetic fields generated, the characteristics of the electrodes, and external influences that affect the arc stability. Understanding this phenomenon is crucial for welders to improve their techniques and achieve better weld quality.
Arc blow is a phenomenon that occurs during welding processes, leading to an unstable arc that can result in poor weld quality or difficulties in maintaining the arc.
Why Arc Blow is Common in D.C. Welding with Bare Electrode
Arc blow is particularly prevalent in D.C. welding with bare electrodes due to several factors:
- Magnetic Field Influence: In D.C. welding, the flow of electric current generates a magnetic field around the electrode. When the electrode is bare, it can create a stronger magnetic interaction, diverting the arc from its intended path.
- Electrode Polarity: In D.C. welding with straight polarity (D.C. electrode positive), the heat is concentrated at the workpiece, which can further intensify the magnetic effects. This can cause the arc to be deflected away from the weld area.
- Electrode Characteristics: Bare electrodes lack coating, which typically helps stabilize the arc in other processes. The absence of this coating means less control over the arc behavior, making it more susceptible to fluctuations.
- Environmental Factors: External factors such as drafts or movement in the welding environment can exacerbate the effects of arc blow in D.C. welding with bare electrodes, causing further instability.
Conclusion
In summary, arc blow is more common in D.C. welding with bare electrodes due to the strong magnetic fields generated, the characteristics of the electrodes, and external influences that affect the arc stability. Understanding this phenomenon is crucial for welders to improve their techniques and achieve better weld quality.
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