Thermal Analysis of Capacitor Discharge Welding and its Correlation With Observed Stress Wave Emission (SWE)

1977 ◽  
Vol 99 (4) ◽  
pp. 379-386
Author(s):  
U. C. Paek ◽  
S. J. Vahaviolos ◽  
G. E. Kleinedler
Keyword(s):  
Thermal Analysis ◽  
Stress Wave ◽  
Weld Zone ◽  
Frequency Discrimination ◽  
Signal Frequency ◽  
Depth Of Penetration ◽  
Conduction Model ◽  
Capacitor Discharge ◽  
Wave Emission ◽  
Capacitor Discharge Welding

A theoretical approach to thermal analysis of capacitor discharge welding is presented. The weld current is divided into three segments (premelting, melting, and postmelting) and each is analyzed with a one dimensional heat conduction model. From this analysis, normalized parameter values are plotted to provide an estimate of the thermal time constant of welding and the extent of melting. The predicted weld zone depth of penetration was experimentally verified with metallographic data. Similarly, using signal frequency discrimination techniques, it was found that Stress Wave Emission (SWE) techniques could be adapted to measure the parameters of the above three pulse segments (tm, te, tc) accurately and in real time. Theoretical and experimental metallographic and SWE results are in good agreement.

Interfacial structures of dissimilar materials joined by capacitor-discharge welding

1994 ◽  
Vol 52 ◽  
pp. 534-535
Author(s):  
C. P. Doğan ◽  
R. D. Wilson ◽  
J. A. Hawk
Keyword(s):  
Rapid Solidification ◽  
Fusion Zone ◽  
Dissimilar Materials ◽  
Solidification Process ◽  
Weld Interface ◽  
Capacitor Discharge ◽  
Fine Grained ◽  
Iron Aluminum ◽  
Conductive Ceramics ◽  
Capacitor Discharge Welding

Capacitor Discharge Welding is a rapid solidification technique for joining conductive materials that results in a narrow fusion zone and almost no heat affected zone. As a result, the microstructures and properties of the bulk materials are essentially continuous across the weld interface. During the joining process, one of the materials to be joined acts as the anode and the other acts as the cathode. The anode and cathode are brought together with a concomitant discharge of a capacitor bank, creating an arc which melts the materials at the joining surfaces and welds them together (Fig. 1). As the electrodes impact, the arc is extinguished, and the molten interface cools at rates that can exceed 106 K/s. This process results in reduced porosity in the fusion zone, a fine-grained weldment, and a reduced tendency for hot cracking.At the U.S. Bureau of Mines, we are currently examining the possibilities of using capacitor discharge welding to join dissimilar metals, metals to intermetallics, and metals to conductive ceramics. In this particular study, we will examine the microstructural characteristics of iron-aluminum welds in detail, focussing our attention primarily on interfaces produced during the rapid solidification process.

Determining the Fatigue Characteristics of Material on the Basis of Stress-Wave Emission

2019 ◽  
Vol 49 (2) ◽  
pp. 91-96
Author(s):  
A. N. Savel’ev ◽  
E. A. Savel’eva ◽  
D. O. Anisimov ◽  
O. D. Prokhorenko
Keyword(s):  
Stress Wave ◽  
Fatigue Characteristics ◽  
Wave Emission

Effect of Capacitor Discharge Welding on Single-Crystal Metals

2000 ◽  
Vol 2 (3) ◽  
pp. 143-150
Author(s):  
Brian K. Paul ◽  
Wiwat Thaneepakorn ◽  
Rick D. Wilson
Keyword(s):  
Single Crystal ◽  
Capacitor Discharge ◽  
Capacitor Discharge Welding
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