Download e-book for kindle: Welding Handbook: Section Two Welding Processes: Gas, Arc by Arthur L. Phillips

By Arthur L. Phillips

ISBN-10: 1349003247

ISBN-13: 9781349003242

ISBN-10: 1349003263

ISBN-13: 9781349003266

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Additional resources for Welding Handbook: Section Two Welding Processes: Gas, Arc and Resistance

Example text

Functions 1 and 3 prevent the pickup of oxygen and nitrogen from the air by the molten metal in the arc stream and weld puddle and the red hot solidified weld metal. This prevents the formation of oxides and nitrides, which can embrittle the weld metal. All the functions are necessary to assure the strength and quality of the weld being made. When properly made, shielded metal-arc welded joints are as strong or stronger than the metal being joined. 4 / Shielded Metal-Arc Welding The electrodes for shielded metal-arc welding are manufactured by extruding and dipping.

Designation of size of combined welds with specified root penetration f 0£51111[0 WELD db ~--go•~ SYIIIIOL SYWIOL. _&< uj SYMBOL O[SIA[O WELD U]} Dlllllt:D WILD SYMIOL Pig. -Designation of root opening of groove welds 0[51111[0 WELD SYMBOL Fig. USH-COHTOVft SYNBOL. £f W£L01NG U~E '9YIUOL. I80L. f-ill ,UIIIINt:O TO SWOOTtt COiif'tt:X . ONTOUR SYWIOL. ltl Ill Fig. -Application of flush- and coll\·ex-contour symbols to groOI-'e welding symbols GJ1100V£ WELOIH15 $Y111801.. 9H0_... IJSE: OF COWIINED DIWENSIO ..

ARC SIDELD The arc shielding action is essentially the same for the covered electrodes, as illustrated in Fig. 2, and for the fabricated electrodes. But the actual method of arc shielding and volume of slag produced varies with different electrode types. The bulk of the core or covering materials in some electrodes is converted to a gas by the heat of the arc, and only a small amount of slag is produced. This type of self-shielding electrode, depending largely upon a gaseous shield to prevent atmospheric contamination, can be identified by the incomplete or light slag covering of the completed welds.

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Welding Handbook: Section Two Welding Processes: Gas, Arc and Resistance by Arthur L. Phillips


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