Spot Welding

Questions and Answers

To extend this question, if the schedule can be the same will there be issues in a push/pull weld arrangement? The two materials are similar. The cold rolled is harder and may distort a little from the heating. The hot rolled is softer.  Both are relatively easy to spot weld. The difference in their individual weld schedules is very small maybe 2%. Yes, they should run on the same weld schedule assuming similar thicknesses and compositions.

Yes, it could be a power problem. It could be a pressure/force problem also associated with the lack of adequate plant supply. There are many other machine components and schedule issues that should not be overlooked. 

These are two articles on related subjects discussed in this blog:

WHY DO WELD NUGGETS VARY DURING A SHIFT?

WHY DO THE FIRST PARTS AFTER A BREAK HAVE UNDERSIZED WELD NUGGETS?


To answer this question, we need to start by defining some words. The question asked appears to be describing extending “HOLD TIME”. This is the time the electrodes remain on the parts exerting force while the part is cooling down.

The word “RETRACTION” is frequently used to describe a cylinder or servo function where the control asks the force device to only open partially to reduce the electrode travel time between welds. More welds can be performed in a short time.

For more information - In this BLOG See:

WHAT IS HOLD TIME IN RESISTANCE WELDING?

WHAT IS A RETRACTION FUNCTION?

A resistance welding schedule has three defined segments. They are:
                                                                                    SQUEEZE

                                                                                       WELD

                                                                                       HOLD

This question comes up frequently. Many look for a formula to set the squeeze and hold time for resistance welding.

Several articles have been written on this subject in this blog:

HOW DO YOU SET THE PROPERSQUEEZE TIME IN A RESISTANCE WEDING SCHEDULE?

IS THERE A FORMULA TO DETERMINE THE SQUEEZE TIME IN RESISTANCE WELDING?

IS SQUEEZE TIME IMPORTANT?

HOW WILL HOLD TIME CHANGE THE RESISTANCE WELD STRENGTH?

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