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Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695

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BuyFindarrow_forward

Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem
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Why must thick sections of aluminum be preheated before an Al-2 electrode is used for welding

To determine

Reason of preheating the thick section of the aluminum for Al-2 electrode.

Explanation

Aluminum electrodes of type Al-2 and Al-3 are designed with DCEP polarity. These electrodes can be used for thin and thick sections. Thick section of aluminum must be preheated before welding up to 300°Fto600°F. When the weld starts, this preheating allows the weld to penetrate quickly

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