What is Shielded Metal Arc Welding (SMAW)?

In case you are already aware of involving SMAW, we would like to share the following with you. “SMAW” is the acronym that stands for shielded metal arc welding and is a common arc welding process used for repair and maintenance of components, industrial fabrication, construction activity, and maintenance activity.

The SMAW process had its beginnings in the world of welding in 1890 when one Charles L. Coffin patented the entire process. SMAW is a flag-handle arc welding process that was found to be performed with great accuracy worldwide.

It may be used for maintenance and production welding in all positions, and all ferrous metals, so it has quite an extensive range of uses.

What is Shielded metal arc welding (SMAW)?

SMAW, in this case defined as shielded metal arc welding, popularly referred to as manual metal arc welding (MMA or MMAW), stick welding and/or informal welding.

This is a very manual method of welding which produces an arc, which can consume electrodes protected with flux to weld metals.

Shielded metal arc welding (SMAW) is a manual welding process, the electrode is a consumable electrode with a metal rod in its center and a flux coating on the outside of the rod.

By application of electrical current, either alternation or direct, an arc is formed between the electrode and the base metal and produces the heat needed to weld. SMAW is still the most utilized method of welding in the U.S.

Flux coating condenses at the weld site and forms a protective outer layer, slag. Both dissuade atmospheric contaminants from infiltrating the weld.

The outer layer protects while vapors develops and vents away to form a shielding gas. As the metal rod absorbs and consumes in a moment, it develops a generally molten pool, or weld.

Stick welding is not as expensive as other processes like TIG is. While the SMAW welder has to manage many parameters that will impact the height and width of the bead, penetration and amount of spatter of the weld, it is still affordable.

The welder can create welds at any position and with any thickness, consideration does not have to be made to drag it to the weld site.

SMAW has its down-sides: slower welding speeds (unless the applicant is a qualified welder) and the amount of slag it generates after the SMAW is complete, and less than ideal spent welding consumables afterwards.

SMAW is still heavily used in the construction of heavy steel structures and in industrial fabrication. The method is frequently used to weld iron and steels (including stainless steel), but it can also be used to weld aluminum, and nickel, and copper alloys as well.

Now that you have the fundamental concepts of SMAW, let’s discuss more specific information on how SMAW works.

How Does SMAW Works​?

SMAW utilizes the thermal energy of the electrical arc to melt the surface of the consumable SMAW covered electrode and the base metal.

The electrode and the work piece comprises two parts of a closed electric circuit that also contains the electricity source, welding cables, the electrode holder, and the ground cable.

The cables connected to the power source are then connected to the work piece and the electrode holder.

When the operator moves the electrode into position on the work piece, an arc is formed between the work piece and the pointed end of the electrode. Both the work piece and the tip of the electrode melts.

The material that is melted at the electrode tip, then transferred from an arc, to a pool, and the pool consumes the filler, and the hotter the arc in SMAW the better! The arc can melt metal at temperatures greater than 9000F!

SMAW Voltage​

There are as many contingencies within arc welding as there are planets. Welding units have an automatic housekeeping system that is based on a pre-determined voltage.

In SMAW, the welder is responsible for maintaining voltage in a manual fashion. In SMAW, the welder subjectively maintains voltage by adjusting the distance from the stick to the workpiece.

SMAW Welding Current​

For certain types of manual SMAW and welding, the sources of Constant current are preferred. These sources set the value of the supplied current, while establishing the need of the ammeter reading.

SMAW Polarity​

In most SMAW welding situations, reverse polarity is used. This allows for maximum penetration and bead characteristics and minimizes excessive spatter-forming small drops of molten material around the welding arc.

SMAW Components​

Some of the basic tools used when stick welding include:

• Arc welding power source (welding machine)
• Electrode lead cable
• Electrode holder
• Leads
• Cables
• Cable connectors
• Ground clamp
• Chipping hammer

Like any welding method, the operator wears protective gear which consists of a helmet, gloves, and coveralls.

What Is SMAW Used For?​

SMAW can be used on a variety of metals and for a wide range of thicknesses. Commonly, SMAW is used in situations where high-volume work is performed in the shop with industrial iron and steel, like cast iron and carbon steel, and low and high-alloyed steel and nickel alloys.

Shielded Metal Arc Welding (SMAW) is used in multiple industries, such as:

• Construction
• Pipeline
• Shipbuilding
• Underwater welding
• Farm Machinery Manufacturing

SMAW welding machines may not be portable, but they are suited for virtually any circumstance, indoor or outdoor…even on ships at sea!

SMAW welding is one of the oldest types of welding, so there will always be innovations of today’s modern technology that’s aimed to improve the methodology and process.

Assuming the SMAW welder has some knowledge on electrode selection, weld speed, and arc length (and we are assuming you start with clean materials), SMAW welding represents a reliable method of welding across many industries.

The Advantages of SMAW

Apart from being a core component of most industrial settings, there are many advantages to SMAW. These include:

• They are more user-friendly.
• They are the most portable process of welding.
• No gas shielding is needed.
• Can be used in many circumstances such as outdoors, shops, pipelines and refineries, ships, bridges, etc.
• Does not react to cold temperatures or direct drafts.
• It can be used on a wide variety of metals and their alloys.
• Can use diesel or gasoline in areas where electricity is not available.
• The skills and machines are available in most industrial centers.

The Disadvantages of SMAW

While SMAW has its good sides, its downsides are what limit people from choosing it. The downsides contain but are not limited to:

• The lack of automation will generally provide lower deposition rates than other processes will.
• Deposition rates for weld metal are lower than other processes.
• Operator skill is required more so than for the other processes.
• The process is not designed for reactive metals such as titanium, columbium, and zirconium.
• Thermal spraying needs some cleanup, as it will splatter and will need more work on cleanup.

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