What does squeeze time mean?

Squeeze time is the period of time programmed into the weld controller, typically between the command to close the electrode and the beginning of weld time (sometimes referred to as the programmed squeeze time).

What is hold time in spot welding?

Hold time is the period of time programmed into the weld controller, typically between the end of weld time and the command to open the electrode. The actual hold time is the amount of time for which the electrode force is applied after current ceases to flow.

What is squeeze type resistance spot welding?

To explain it just a bit deeper it is a weld that typically bonds two or more panels/parts together by creating an electrical resistance between two electrodes. The electrodes don’t touch, they attempt to pass current through the location, thereby heating the metals to a point of welding them together.

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What is the difference between hold time and squeeze time?

The squeeze time should be sufficient to overcome poor fit-up of the parts to be welded. In practice, it is similar for both uncoated and coated steels. The hold time is the time during which the electrode force is maintained after the welding current flow ends, its purpose being to consolidate the weld.

What does Strsw stand for?

When performing squeeze type resistance spot welds (STRSW), it is always important to make sure the tips are properly dressed. Failure to do so can result in an inferior weld.

How are spot welding parameters calculated?

One general criterion of resistance spot-welding is that the weld shall have a nugget diameter of 5*t1/2, “t” being the thickness of the steel sheet. Thus, a spot weld made in two sheets, each 1 mm in thickness, would generate a nugget 5 mm in diameter according to the 5*t½-rule.