Introduction

To avoid excessive reduction in mechanical strength, conventional soft solders are generally limited to maximum operating temperatures of approximately +50 deg F (+30 deg C) below the solder melting point. The highest melting temperature for easy-to-handle soft solders is in the +570 deg to +585 deg F (+300 deg to +310 deg C) range, thus limiting the operating temperature range to +520 deg to +535 deg F (+270 deg to +280 deg C). Micro-Measurements M-LINE Solder 570-28R is a soft solder within this range.

Environmental applications which exceed these operating temperatures require other lead attachment techniques. Resistance soldering, spot welding, and flame welding are common alternatives. This publication is restricted to the resistance soldering technique with silver solder paste. For practical demonstration purposes, the WK-Series strain gage has been selected.

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