Is TIG welding DC positive or negative?

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Is TIG welding DC positive or negative? TIG welding, also known as gas Tungsten welding or AC Welding (GTAW), is a popular welding process with high precision and control. DC polarity significantly affects TIG welding.

In this guide, I’ll discuss Whether TIG welding DC is positive or negative. What are the Advantages and disadvantages of TIG welding? What is TIG mainly used for? DC polarity in TIG welding, provide a detailed buyer’s guide to help you choose the right equipment, and discuss the key factors to consider when TIG welding—bad welds and results. Welders gain confidence and efficiency by mastering DC positive and DC negative polarities.

This article will explore whether TIG welding DC is positive or negative. Its effects and its uses.

What is TIG Welding?

TIG is an anagram for “Tungsten Inert Gas.” Tungsten is the type of wire (a tungsten electrode) applied to send the welding current to the object and make the arc. Inert Gas is an inert gas (like Argon) that protects the weld and keeps it from oxidizing.

TIG is also called GTAW, which means Gas Tungsten Arc Welding.

In simple words, TIG welding is like oxy-fuel welding. But instead of a flame, the process employs an electrical spark to melt the material and filler metallic materials. Instead of a warming flame, inert gas is required to keep the weld from oxidizing. It is used like welding with an oxygen spark. As needed, hand-add the filler material. The spark is much easier to control since the current doesn’t go through the filler metal (like in MIG and MMA welding).

What are TIG welding’s Advantages and disadvantages?

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  • This process can get very low amperages, making it perfect for thin welding materials. Also, because the spark and the placement of the filler metal are separate, TIG welding is relatively easy to control and can make very high-quality lines that look great. TIG welding doesn’t create dust like MIG and MMA welding, so it’s easy to clean up.
  • TIG is usually used when the physical appearance of the weld is essential (like on stairs) or when the quality of the weld is necessary (like on pressure tanks or pipes).


  • While TIG welding is more controlled, it is also slower and more arduous than MIG or stick/MMA welding, and it only works well on filthy or rusted materials, requiring extra weld preparation.

What metal is used in TIG welding?

  • TIG welding equipment that uses “DC” (Direct Current) may be used to weld a range of “ferrous metals,” such as mild steel and stainless steel, as well as copper and chrome moly. (However, NOT aluminum).
  • Some inverter stick/MMA welders, such as the Weldforce WF-140ST and WF-180ST, feature DC TIG capabilities.
  • You’ll need “AC” (Alternating Current) equipment to Tig weld aluminum.
  • Such machines often have AC and DC capacity (“AC/DC”) in one device, allowing them to weld metals such as aluminum, steel, stainless, copper, chrome-moly, etc.
  • AC/DC machines, such as the Weldforce WF-201T by Weldclass, are typically specialized TIG welding machines (with stick/MMA capability as an added function). 

What Gas is used in TIG welding DC, Positive or negative?

Polarity refers to the direction of current flow in TIG welding. DC-polarity DC TIG welding is standard for steel, stainless steel, and other materials. This involves connecting the TIG torch to the negative (-) terminal and the earth leading to the positive (+) terminal. This arrangement is extensively used because it consistently produces good welding results.

Most typical TIG welding applications need pure Argon (100% Ar). Some essential applications may require particular Gas.

Is TIG welding DC positive or negative?

DC Positive (DC+) Polarity

Direct current (DC) power is frequently used for TIG welding and can be used with both DC-positive and DC-negative polarities. The type of metal being welded and the desired result influence the polarity choice.

The polarity known as DC Positive (DC+) is also known as “DC electrode positive” or “DC reverse polarity.” The electrode (or tungsten) is linked to the positive terminal of the power supply while TIG welding with DC positive. This configuration provides higher penetration for welding metals like stainless steel and nickel alloys. It produces a smaller, deeper weld bead, offering more profound penetration into the base material.

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DC Negative (DC-) Polarity

TIG welding may be done with both DC positive and DC negative polarities, each with benefits. The electrode is connected to the positive terminal when using DC positive polarity. Giving deeper penetration and compatibility for thicker materials. On the other hand, DC negative polarity connects the electrode to the negative terminal, resulting in a smaller and more focused arc, excellent for expert welding on thinner materials.

Read more: What is Gas Metal Arc Welding?

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The desired welding speed, joint arrangement, and material thickness are all factors that affect polarity. While DC positive polarity is advantageous for more extensive materials that need strong welds, TIG welding DC positive or negative is superior for complex and accurate welding on thinner parts. As a result, choosing the reverse polarity in TIG welding DC, positive or negative, is a critical choice that affects the quality and features of the weld.

The Best Polarity for Your TIG Welding

Several aspects must be considered while establishing the polarity for your Tig welding DC positive or negative job. Consider the following principles before deciding on a straight polarity:

  • Determine if the base metal is ferrous or non-ferrous. Non-ferrous metals benefit from DCEP polarity, while ferrous metals need DCEN polarity.
  • Assess the individual welding process requirements, considering elements that include heat input, deeper weld penetration, and desired weld aesthetics.
  • Choosing an Electrode: distinct tungsten electrode types have unique properties and performance when used in different polarities. Consult our recommendations for non-consumable electrodes for appropriate polarity use to prolong tungsten electrode life.


In this article, You will learn the polarity used in TIG welding DC, positive or negative, has an essential effect on the quality and properties of the weld. Positive polarity DCEP provides deep penetration, but DC negative polarity is more precise. When choosing polarity, welders must consider the thickness of the material, the kind of junction, and their skill level. Welders may generate strong, perfect welds that match the standards of many sectors by grasping the basics of TIG welding polarity.


Can I switch polarity during TIG welding?

Switching polarity mid-weld is not recommended, as it can lead to inconsistent results and potential defects in the weld.

Is DC-positive polarity always better for thicker materials?

While DC-positive polarity often provides better penetration for thicker materials, the choice also depends on joint configuration and desired outcomes.

Can I use the same polarity for all metals?

No, polarity selection should consider the type of metal, its thickness, and the welding requirements to achieve optimal results.

Is DC negative polarity suitable for aluminium welding?

Yes, DC negative polarity is commonly used for welding aluminium.

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