By Editor A. Davidson
The 5th quantity of this publication describes the varied concepts on hand for everlasting becoming a member of, starting from mechanical becoming a member of, welding and soldering, to gluing, winding and braiding (From within entrance disguise)
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Extra info for Handbook of Precision Engineering: Volume 5 Joining Techniques
Less sensitive to sulphur than electrodes with acid coatings. High melting rate. Suitable as contact electrodes for thin sheet metal. e Deep penetration electrodes with a heavy coating. Suitable for heavy sheet metal work(~ 12 mm) without preparation. e Basic electrodes not containing iron oxides in the coating. Short arc, sensitive to moisture. Very slight tendency to freeze. The slag melts slower than the electrode metal, which makes the electrode suitable for vertical welding. Satisfactory for low alloy steels and steels with carbon and sulphur contents higher than those of steels that can easily be welded.
If the electrode takes up a position perpendicular to the workpiece, the m~gnetic force will give the metal arc a direction opposing 33 WELDING Fig. 6. Pinch effect in overhead welding. 3 = electrode. 1 = arc. 2 = constriction. 4 = workpiece. that of the current (Fig. 7). On the other hand, however, if welding takes place at the edge of a magnetic workpiece, a magnetic force bends the arc inwards (Fig. 8). This phenomenon is known as boundary effect. Especially when thin sheet steel is welded, does this edge effect give rise to difficulties.
2 Cold pressure welding by impact (explosion welding) us. 19 1 Welding methods With nitrocellulose as the explosive powder, a welding pressure is built up in the very short time of 30-50 ms (Fig. 23). Because of the heat developed by friction, a lower pressure is required than for the cold welding process described above. Furthermore, there is no real distinction between cold pressure welding at a stamping speed of 10 to 30 mmfmin. and explosion welding with stamping speeds varying form 400 to 900 mmfs.