How to Tack Weld

Tack welding is a unique welding method designed from the ground up to help provide a temporary weld. So this is not a final welding method, instead it’s in place to hold parts together so you can use another welding method and finalize. Which is interesting, because sometimes you need a partial/temporary welding system before the final one.

How does it work?

  • First, you place the tack at the center of the joint, and the proceed so you tack along the joint
  • Make sure that you alternate on both sides, start at the middle and work towards the end.
  • It’s also ok to start at the ends and bisect. This method is more suitable if you have some experience with tack welding already, and it can work very nicely if you do it properly.

When is it ideal to use tack welding?

Believe it or not, tack welding is very useful and suitable for a multitude of different situations. If you have large parts, a thin stock or complex geometries, tack welding is very efficient and reliable. On top of that, it can be great for welds where you can’t use fixtures and clamps. There’s also the fact that you can use tack welding in case where you have stress caused whenever parts need to be moved.

What types of tack welding are there?

  • Standard tack welding is used when you add tack welds in the joint, with the focus on having them consumed by the final weld. They are designed to help keep the pieces together until the final weld.
  • Bridge tack welding is great if you have a joint design which needs a root opening. This method is very reliable when it comes to pipes. It’s a more difficult tack welding method designed mostly for experts. Beginners can end up adding too much heat, and that becomes a problem. The tacks are not penetrating the joint root, so this can actually be a great advantage.
  • Hot tack welding is better when you don’t care as much about the weld quality. As we said earlier, heat can end up bringing a very powerful contraction. But if you pay attention, this method can work quite well since you use hot tacking plates.

The benefits of tack welding

Even if tack welding is not final, it does help maintain the components in place. On top of that, it maintains the joint gap and it also complements the fixture function, while also permitting the removal of that fixture if it’s needed. It also allows you to ensure that everything gets aligned the way you want and that there are no errors, which can sometimes be an issue.

As you can see, tack welding is very helpful and it’s one of those welding methods that can make a huge difference. We highly recommend using tack welding because it’s efficient and it can help provide a very good set of benefits. Since it’s so useful and dependable, tack welding is very important, especially if you want to prepare a more complex weld!


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