Everything You Need to Know to Start Welding Safely and Successfully

Metal Manual Arc (MMA) welding—also known as Stick welding or Shielded Metal Arc Welding (SMAW)—is one of the oldest, most reliable, and widely used welding processes in the world. Despite the rise of modern welding methods like MIG and TIG, MMA welding remains a favourite among professionals, farmers, fabricators, construction workers, maintenance engineers, and DIY enthusiasts.

Its simplicity, versatility, and ability to perform well in outdoor conditions make it an invaluable skill to learn.

Whether you’re completely new to welding or looking to understand the fundamentals before buying your first welder, this guide covers everything you need to know about MMA welding—from how it works to choosing electrodes, setting your machine, and producing quality welds.

What is MMA Welding?

MMA (Metal Manual Arc) welding is a manual arc welding process that joins metal using:

An electric arc
A consumable flux-coated electrode (commonly called a welding rod or stick)
Heat generated by electrical current

When the electrode touches the workpiece and is then slightly lifted away, an electrical arc forms. This arc reaches temperatures of over 6,000°C, melting both the electrode and the base metal.

As the electrode melts, it deposits filler metal into the weld joint while the flux coating burns away, creating shielding gases and a protective slag layer that prevents contamination from oxygen, nitrogen, and moisture in the atmosphere.

Once the weld cools, the slag is chipped away to reveal the finished weld.

Why Choose MMA Welding?

There are several reasons why MMA welding has remained popular for decades.

Excellent Portability

Unlike MIG welding, MMA welders do not require gas cylinders.

This means you only need:

A power source
Welding leads
Electrodes

Many inverter welders weigh under 6kg, making them ideal for mobile work.

Works Outdoors

Wind quickly blows shielding gas away from MIG welds.

Since MMA electrodes create their own shielding gas, stick welding performs exceptionally well outdoors in windy conditions.

This makes it the preferred choice for:

Construction
Agricultural repairs
Structural steel
Pipeline work
Site maintenance

Handles Rust and Dirty Steel Better

Although clean metal is always best, MMA welding is far more forgiving than MIG.

It can successfully weld:

Rusty steel
Painted surfaces (after preparation)
Galvanised steel (with appropriate safety precautions)
Slightly contaminated material

Affordable Equipment

A good inverter MMA welder is often the least expensive way to start welding.

There are:

Fewer accessories
Lower running costs
Minimal maintenance

How Does MMA Welding Work?

The process is surprisingly straightforward.

The welder supplies electrical current.
Current travels through the electrode holder.
The electrode touches the metal.
Pulling the rod back slightly creates an electric arc.
The arc melts both materials.
Molten metal forms a weld pool.
Flux burns to protect the weld.
Slag covers the cooling weld.
Slag is removed after cooling.

Maintaining a consistent arc length is one of the most important skills a beginner learns.

Components of an MMA Welder

Every MMA setup includes several essential parts.

Power Source

Modern machines are usually inverter welders.

They offer:

Stable arc characteristics
Lightweight construction
Lower power consumption
Better efficiency

Older transformer welders still exist but are much heavier.

Electrode Holder

Often called the stinger, this clamps the electrode and carries current.

Earth Clamp

The return lead connects directly to the workpiece, completing the electrical circuit.

A poor earth connection causes:

Difficult arc starts
Unstable arc
Excessive spatter

Welding Leads

Heavy-duty cables carry electrical current between the welder and the workpiece.

Damaged cables reduce welding performance and should be replaced.

Understanding Polarity

One of the first things beginners notice is the two output terminals on the welder.

These determine polarity.

DC Electrode Positive (DCEP)

Also called reverse polarity.

Common for many electrodes because it offers:

Deeper penetration
Stable arc
Smooth bead profile

DC Electrode Negative (DCEN)

Sometimes preferred for:

Thin material
Certain specialist electrodes

Always follow the electrode manufacturer’s recommendation.

What Are Welding Electrodes?

Electrodes are consumable rods consisting of:

Steel core wire
Flux coating

The core becomes filler metal.

The coating provides:

Shielding gas
Arc stabilisers
Alloying elements
Slag formation

Different electrodes suit different applications.

Common Electrode Types

E6013

The most beginner-friendly electrode.

Best for:

General fabrication
Thin steel
Home workshops
Gates
Trailers
Garden equipment

Advantages:

Easy to strike
Smooth arc
Attractive welds
Easy slag removal

E7018

A low-hydrogen electrode widely used for structural work.

Provides:

High-strength welds
Excellent crack resistance
Tough weld metal

Requires:

Dry storage
Better technique

E6010 / E6011

Designed for deep penetration.

Ideal for:

Pipe welding
Dirty steel
Root passes
Farm repairs

Produces a more aggressive arc than E6013.

Electrode Sizes

Larger rods require more current.

Typical guide:

Electrode	Current Range
1.6 mm	25–45A
2.0 mm	40–70A
2.5 mm	70–100A
3.2 mm	90–130A
4.0 mm	130–180A
5.0 mm	180–240A

These are starting points only—always check the manufacturer’s recommendations.

Choosing the Correct Amperage

Too little current causes:

Rod sticking
Poor penetration
Irregular welds

Too much current causes:

Excessive spatter
Undercut
Burn-through
Overheated electrodes

A properly adjusted machine produces a smooth, consistent arc that sounds similar to frying bacon.

Preparing the Metal

Good preparation dramatically improves weld quality.

Remove:

Heavy rust
Paint
Oil
Grease
Mill scale where practical

Use:

Angle grinder
Wire brush
Flap disc
Degreaser

Clean metal produces stronger, cleaner welds.

Joint Types

The joint determines weld strength.

Common joints include:

Butt Joint

Two plates joined edge to edge.

Used extensively in fabrication.

Lap Joint

One plate overlaps another.

Very common for thin steel.

T-Joint

Forms a “T” shape.

Often used in framework.

Corner Joint

Common in box section fabrication.

Basic Welding Positions

Flat (PA)

The easiest position for beginners.

Horizontal (PB)

Requires better puddle control.

Vertical (PF/PG)

One of the more difficult positions.

Requires slower movement.

Overhead (PE)

The most challenging position.

Molten metal naturally wants to fall, demanding excellent technique and appropriate protective clothing.

Striking an Arc

Beginners often struggle with starting.

Two common methods are:

Scratch Method

Similar to striking a match.

Tap Method

Tap the rod onto the metal before lifting slightly.

Maintaining Arc Length

The ideal arc length is roughly equal to the diameter of the electrode core.

Too long:

Spatter
Weak penetration
Unstable arc

Too short:

Electrode sticks
Poor visibility
Irregular bead

Travel Speed

Travel too slowly and you’ll create:

Large welds
Excessive heat
Burn-through

Travel too quickly and you’ll see:

Narrow welds
Poor fusion
Incomplete penetration

Aim for a consistent speed while watching the molten weld pool rather than the arc itself.

Electrode Angle

A general guideline is to hold the electrode at approximately 10–20° in the direction of travel (a drag angle for most electrodes).

Maintain a comfortable position so you can move steadily and keep the arc length consistent.

Understanding Slag

Slag protects the weld while cooling.

After cooling:

Chip it away
Wire brush the weld
Inspect for defects

Never weld over slag.

It traps contamination.

Common Welding Defects

Porosity

Small holes caused by contamination or moisture.

Undercut

Grooves along the weld edges.

Usually caused by excessive current or travelling too quickly.

Lack of Fusion

Occurs when weld metal fails to bond properly.

Common causes include:

Low amperage
Incorrect angle
Excessive travel speed

Slag Inclusions

Slag trapped inside the weld.

Often caused by poor cleaning between passes.

Cracking

Can result from:

Rapid cooling
Incorrect electrodes
Hydrogen contamination
Poor joint design

Essential Safety Equipment

Never weld without proper PPE.

Minimum equipment includes:

Auto-darkening welding helmet (appropriate shade for the current used)
Leather welding gloves
Flame-resistant cotton or leather jacket
Welding apron (optional but recommended)
Leather boots
Safety glasses for grinding and chipping slag
Ear protection when grinding
Respiratory protection where ventilation is insufficient or when welding materials that produce hazardous fumes

Avoid synthetic clothing, which can melt onto the skin when exposed to sparks.

Welding Safety Tips

Always:

Work in a well-ventilated area.
Keep flammable materials away from the work area.
Inspect cables and equipment before use.
Keep the work area dry.
Ensure a good earth connection.
Protect nearby people from arc flash using welding screens.
Allow hot metal to cool before handling.
Have a suitable fire extinguisher nearby and remain alert for smouldering materials after welding.

Beginner Practice Exercises

The fastest way to improve is through repetition.

Start with:

Straight stringer beads.
Parallel beads.
Overlapping beads.
Lap joints.
Butt joints.
Fillet welds on T-joints.

Focus on consistency before tackling more advanced positions.

Advantages of MMA Welding

Inexpensive equipment
Excellent portability
Works outdoors
No shielding gas required
Handles thicker materials well
Tolerates less-than-perfect surface conditions
Suitable for maintenance and repair work
Reliable in remote locations

Disadvantages of MMA Welding

Slower than MIG for long production welds
Electrodes must be replaced frequently
Slag must be removed between passes
Requires more practice to master
Not ideal for very thin sheet metal
Produces more spatter than some other processes

Tips for Better Welds

Success comes down to mastering a few fundamentals:

Clean the metal thoroughly whenever possible.
Choose the correct electrode for the job.
Set the appropriate amperage.
Keep a short, consistent arc.
Watch the weld pool rather than the bright arc.
Maintain a steady travel speed.
Clean slag completely before additional passes.
Practise regularly on scrap steel before attempting critical projects.

Final Thoughts

MMA (Stick) welding remains one of the most practical and versatile welding processes available. Its ability to produce strong welds without the need for shielding gas, combined with its portability and reliability in outdoor environments, ensures it continues to play a vital role in fabrication, repair, construction, and maintenance.

Like any hands-on skill, proficiency comes with practice. Early attempts may include uneven beads, occasional sticking electrodes, or inconsistent arc length, but these are all part of the learning process. By understanding the principles behind the arc, selecting the right electrode, preparing your material properly, and following safe working practices, you’ll build a solid foundation for producing strong, dependable welds.

Whether your goal is repairing farm machinery, fabricating workshop projects, or beginning a career in welding, mastering MMA welding is an excellent place to start. Once you’ve developed confidence with stick welding, the techniques you learn—such as controlling the weld pool, managing heat input, and maintaining consistent travel speed—will transfer readily to other welding processes, making MMA one of the best introductions to the wider world of welding.

The Complete Beginner’s Guide to MMA (Stick) Welding