6 Best Welding Magnets For Fitup Pros Swear By

Getting metal framing aligned perfectly is the difference between a square structure and a headache that persists until the final trim is installed. When working with metal roofing sub-structures or custom brackets, poor fitup results in uneven gaps that compromise structural integrity and aesthetic finish. A reliable set of welding magnets acts as a permanent extra pair of hands on the job site. This guide covers the essential magnetic tools that keep steel components locked in place while the arc is struck.

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Strong Hand Tools MSA46-HD: Best All-Around Magnet

The MSA46-HD is the workhorse of the welding world for good reason. It provides a consistent, multi-angle hold that functions reliably across various steel thicknesses.

When framing out metal shed roofs or mounting heavy-duty flashing supports, this magnet handles the weight without slipping. Its versatility allows for 45, 90, and 135-degree setups, which covers almost every standard joint encountered in structural metal work.

The primary advantage is the balance between grip strength and ease of removal. It remains powerful enough to keep the piece steady but doesn’t require a pry bar to shift once the tack weld is set.

Magswitch MagSquare 400: Strongest Switchable Hold

Switchable magnets solve the age-old problem of iron filings and debris sticking to the tool throughout the work day. The Magswitch MagSquare 400 uses a mechanical dial to engage and disengage the magnetic field instantly.

This is the preferred choice when precision is non-negotiable. Because the magnet can be turned off, it won’t pull the workpiece out of alignment during the final placement phase.

Its extreme holding power is ideal for heavy steel gauge work or when building load-bearing roof trusses. Just ensure the work surface is clean, as the power is so intense that even a thin layer of mill scale can create a pivot point if the base isn’t seated flat.

Hobart 770074 Arrow Magnet: Best Value for The Money

The Hobart Arrow magnet is a no-frills, reliable tool that belongs in every truck box. It uses a standard fixed magnetic design that excels in simple 90-degree corner joints.

While it lacks the sophisticated switching mechanisms of high-end models, it provides immense value for standard tasks like squaring up steel rafters. It is lightweight, durable, and performs consistently even when dropped on concrete floors.

It is recommended to buy these in pairs or quads to keep multiple joints aligned simultaneously. For the price, the ability to build a fully squared frame without needing specialized clamping jigs makes this an essential purchase.

Bessey WSM-9-7 Welding Magnet: Ultimate Angle Control

When the project calls for complex geometry, the Bessey WSM-9-7 stands apart. Unlike static magnets, this tool features an adjustable design that allows for fine-tuning the angle to exact specifications.

This level of control is necessary for custom metal roofing brackets or non-standard hip rafters. The ability to lock in a specific degree ensures that the weldment matches the shop drawings exactly.

The trade-off is size and weight; this is a bulkier tool that requires more clearance to operate. Save this for bench work or shop fabrication where precision outweighs the need for speed and portability.

Forney 70707 Switchable Magnet: A Pro’s Compact Choice

The Forney 70707 offers the benefits of switchable technology in a compact footprint. It is specifically useful for those working in tight spots, such as inside metal wall girts or tucked under eaves.

The switch mechanism allows for quick repositioning, which keeps the workflow moving during high-volume welding days. It is surprisingly robust for its size and holds firmly against flat or round tubing.

Keep in mind that while it is powerful, its smaller surface area means it isn’t suited for heavy structural beams. It is the perfect companion for detailing, brackets, and smaller metal components.

Strong Hand Mag-Tab Holders: Best for Small Part Fitup

Small tabs and gussets are notoriously difficult to hold steady with traditional clamps. The Mag-Tab holder solves this by using a small, high-intensity magnet to grip the tab while leaving both hands free for the torch.

These tools are indispensable when installing metal stiffeners on thin-gauge sheet metal. They hold the component firmly against the base material without creating the interference that larger magnets would cause.

Using these allows for cleaner, more accurate tacks on smaller parts. It significantly reduces the frustration of having a small piece drift away at the exact moment the arc is initiated.

Switchable vs. Fixed Magnets: Which Is Right for You?

Fixed magnets are simple, affordable, and nearly impossible to break. They are excellent for repetitive 90-degree tasks, but cleaning the accumulated metal shavings off them can be a tedious chore.

Switchable magnets offer convenience and safety. By turning the magnet off, the tool releases the workpiece instantly, preventing the accidental shifting of aligned parts.

Choose switchable models for high-precision, repetitive tasks. Opt for fixed magnets if the budget is tight or if the work environment is exceptionally rough, as they have fewer internal parts to fail.

What Pull Force Do You Actually Need for the Job?

Pull force ratings on magnets can be misleading because they are measured on thick, clean, flat steel. In the real world, the holding power decreases significantly when the steel is painted, pitted, or thinner than the magnet’s effective range.

For standard square tubing or angle iron on light construction, a 40-50 lb pull force is usually sufficient. For structural work or heavier plate steel, target tools rated for 150 lbs or more.

Always err on the side of caution and use a larger magnet than technically required. Having that extra buffer ensures the workpiece stays put even if the tool is bumped or the metal surface is less than perfect.

Using Magnets Safely Around Your Welder’s Arc

Magnets and welding arcs have an uneasy relationship. If the magnet is placed too close to the arc, the magnetism can cause “arc blow,” which deflects the arc and creates porosity or uneven weld beads.

Maintain a distance of at least two to three inches between the magnet and the weld puddle. If the design forces a closer placement, shift the magnet back as soon as the initial tack welds are secure.

Furthermore, do not subject magnets to extreme, prolonged heat. High temperatures can cause permanent loss of magnetic strength, effectively ruining the tool for future use.

Keeping Your Welding Magnets Clean and Strong

The lifespan of a welding magnet depends entirely on how well it is kept free of metallic debris. Metal filings act as spacers that weaken the grip and eventually scratch the surfaces the magnet is meant to hold.

After each use, wipe down the magnetic faces with a rag or use a piece of duct tape to pull off stray metal dust. Store them in a dedicated container where they aren’t clinging to other tools or sensitive electronic equipment.

A well-maintained magnet will provide years of reliable service. Treating these tools with care ensures that they maintain their factory-rated pull force, keeping joints tight and safe throughout the project.

Selecting the right magnet boils down to the specific metal thicknesses and geometry involved in the build. Match the pull force and switching capability to the intensity of the project to ensure the highest quality results. When used correctly, these tools turn complex fitups into a straightforward process.