What is a Tack Weld? Definition, importance and proper usage.

Welding is a very diverse and complicated field as it requires the welder to employ numerous welding techniques to execute the welding project successfully. Tack welding is one of those underrated welding techniques that are of great importance because it helps to achieve top-notch welds.

What is a tack weld? These are temporary and initial welds to align the base metals because of final welding. After making tack welds, there remains no need for attachments to hold the workpiece metals properly. If you want to know in detail about tack welding, then proceed with reading.


Why are tack welds required?

In order to weld base metals in the right way, you need to position them, which you can do by utilizing fixtures or creating tack welds. By far, the tack welds are a better option than fixtures as they maintain the gap between the base metals because the slight change in the gap can create colossal trouble.

The key benefit of tack welds is you do not have to worry about the alignment of the metal workpieces while final welding, which is incredible. Apart from that, if you find that the alignment of the base metals is not accurate, you can easily remove tack welds and correct their position.

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What to avoid while creating tack welds?

While tack welding, the most important thing to remember is that these welds do not affect the final welds’ quality. Poorly built tack welds will eventually result in cracks, hard spots, carters, etc., in final welds, so the fault in tack welds can ruin the whole welding project. If the base metals are not lined properly while creating tack weld, then there will be a chance that they will fall apart.

As the tack welds are temporary, that’s why they are weak, so be careful when handling these welds. Other than that, some metals are reactive to the sharp cooling of tack welds. In many cases, the portion of the base metals where heat is employed comes out brittle and becomes prone to cracks.

What are the advantages of tack welding?

As mentioned before, tack welding is very popular among welders, no matter what the size of the welding project is. The reason is tack welds are integral for perfection in welding, and also they improve the quality of welds. Following are some major benefits of tack welding:

  • It restricts the movement of base metals during final welding
  • Adds strength in the welds
  • Ensures that all the metal are lined perfectly
  • Preserve the upper joint gap

What are the risks of faulty tack welds?

The defects in the tack welds can cause damage to lives and property. Therefore, the tack welds must be clean from any hard spots, slags, cracks, etc. Even a minor crack in the welds can wreck the entire structure. Like any other thing, quality is also important in tack welding. That’s why certified and skilled welders should perform it.

The procedure that is to be followed to produce tack welds must curb distortion. Moreover, it is better to clean tack welds before moving on to final welding. By doing so, you will clean metal oxides. For a better look, you can ground both ends of the tack weld.


Q.1 What is the difference between spot welding and tack welding?

Ans: The best way to distinguish between spot and tack welds is that tack welds are performed to position and arrange the materials, which are temporary. In contrast, the spot welds formed for the permanent joining of metals.

Q.2 Can you use a stick welder to weld aluminum?

Ans: Shielded metal arc welding (SMAW), also called stick welding, is a form of arc welding with low operation cost, so it is suitable for small fabrication and DIY welding. But still, you can use it to smoothly weld aluminum metal workpieces.

Q.3 What is the recommended set-up of welding amperes for tack weld?

Ans: Most of the 225 to 300 amps stick welders are capable of handling anything that may face later, as most of the tack welding tasks require 200 or fewer amps. On the other hand, if you have to tack weld workpieces of ⅜ inches or above thickness, then you have to make multiple passes rather than increasing the amperes.

Final Words:

Due to the rapid headway in technology, most welding methods are either semi-auto or fully automated. In spite of that, manual assistance is still necessary to get premium weld quality. Tack welds are of great significance in any major welding endeavor.

Tack welding makes sure that all the materials you have to weld get in perfect alignment for top-tier quality. Like any welding technique, you must wear safety gear because a minor mistake or accident can be hazardous for you.