Are welded frames stronger than wooden frames?

Yes, at scale. A welded corner spreads load across the full cross-section of the profile rather than concentrating it on a glued mitre, which is the limiting factor for large timber frames. At sizes over roughly 1.2m on the long edge, welded construction is the structurally honest answer.

Can welded frames be made any size?

In practice, up to the workshop maximum of 4.5m x 3.5m. The welding itself is not the limit; transport and handling are. For projects beyond that, we build in sections and weld the final corners on site.

How heavy are aluminium welded frames?

Aluminium has a high strength-to-weight ratio, so even very large welded aluminium frames are typically lighter than the equivalent in welded steel and not significantly heavier than the artwork they hold. A two-metre aluminium frame often weighs less than the canvas it carries.

Do welded frames rust?

Aluminium welded frames do not rust. Aluminium oxidises in a self-limiting way that protects the underlying metal, and anodised or painted finishes add a second layer of protection. Steel welded frames do need a protective finish to prevent rust, which is one of the reasons aluminium is our default welded material.

What is the difference between welded and clip frames?

Clip frames hold artwork between glass and backing with metal clips. They are off-the-shelf, mass-produced and not load-bearing. Welded frames are bespoke aluminium or steel frames with welded mitred corners, used at sizes and weights where clip frames or timber frames would not hold the work safely.

Are welded frames suitable for canvas?

Yes. Welded aluminium subframes can be built to support oversized stretched canvas where mitred-and-pinned timber would deflect under the weight of the stretcher. Welded tray formats also pair well with canvas because the thin profile sits cleanly against the depth of the stretcher bar.

How do welded frames hang on the wall?

Welded frames usually use integrated hanging fittings, welded into the rear of the frame at the workshop. Common options are D-rings, security plates, or a French cleat system. The fittings are matched to the wall and the weight of the piece on quote.

Can welded frames be repaired?

Yes. A welded mitre that has been damaged can be re-welded; the frame does not need to be remade. This is one of the long-term advantages over glued-mitre timber frames, which usually have to be rebuilt at the corner if the joint fails.

What is a Welded Picture Frame?

A welded picture frame is a frame whose mitred corners are joined by welding rather than by mechanical fastening or adhesive. Welded frames are used at sizes and weights where traditional timber joinery would fail.

This guide covers how welded frames differ from traditional moulded timber frames, when aluminium is the right choice and when steel is, why welded construction matters at scale, when you actually need a welded frame, how we build them in our dedicated metalwork department, the finishes available on welded aluminium, the size range we can deliver, what they cost, and the sectors that order them.

How welded frames differ from traditional moulded frames

Traditional moulded timber frames have mitred corners that are pinned, glued and clamped. The strength of those joints comes from the friction and adhesive bond between two cut faces of timber. It works well at most domestic sizes. The limit is the corner: at large scale the cumulative weight of the artwork plus the lever arm of the frame puts more force on the glued mitre than it can hold.

A welded frame has mitres that are fused at the corner. There is no glue line and no mechanical fastener. The corner is structurally continuous with the rest of the profile. Welded aluminium profiles can also be drawn from extrusion in shapes that timber moulding cannot match: very thin walls with high stiffness, square-edged industrial profiles, deep box sections engineered for oversized work.

Aluminium welded frames vs steel welded frames

Aluminium is the default material for most welded picture framing. It has the highest strength-to-weight ratio at scale, takes finishes well, and is straightforward to handle when a frame is two or three metres on the long edge. An aluminium picture frame at that size is typically lighter than the artwork it carries.

Steel welded frames are used where the structural maximum needs to go beyond what aluminium offers, or where a specific industrial finish is wanted, such as brushed steel or a raw mill surface. Steel reads as a metal picture frame in a heavier register, both visually and physically. At Harten, welded aluminium is our primary welded product; we reference steel for contrast because the question of which metal to choose comes up almost every time.

Why welded construction matters at scale

Oversized work cannot be made structurally sound with mitred-and-pinned timber alone. Once an artwork is over roughly 1.2m on the long edge, and certainly past 2m, the corner joint becomes the weakest point of the frame. The accumulated weight of canvas, glazing, mount and backing, multiplied by the lever arm of the frame profile, applies more force at the mitre than glue and pins can resist over time. A welded corner spreads load across the full cross-section of the profile, not just the surface of two cut faces. Welded aluminium subframes can also be built with internal cross-bracing that is not possible in timber. We cover the practical side of measuring this kind of work in our guide to measuring for oversized frames. The structural argument is the reason welded construction exists in the picture-framing trade in the first place, and it is the single most important thing to understand about oversized framing.

When you need a welded frame

There are five recurring situations where a welded frame is the right answer rather than a luxury upgrade:

Oversized artwork. Anything over 1.2m on the long edge, and certainly anything over 2m, where traditional timber joinery is at or past its limit.
Heavy artwork. Face-mounted prints on dibond, deep box-canvas pieces, and mixed-media work where the frame is structural rather than decorative.
Industrial-finish aesthetics. Raw aluminium, brushed steel, anodised black: finishes that timber moulding cannot replicate honestly.
Gallery installations with security requirements. Welded aluminium subframes can carry integrated theft-deterrent fixings and bespoke hanging plates welded directly into the rear of the frame.
Contemporary aesthetic. On some pieces the visible welded corner itself is part of the design language, and a square-edged industrial profile is the work, not just the housing for it.

The welding process at Harten

Harten runs a dedicated metalwork department alongside the timber workshop. Profiles are cut to length and mitred to the corner angles required by the piece. The mitres are then precision-welded, not glued, not pinned, not bolted. For oversized work, an integral subframe is welded inside the visible frame to carry the weight that the outer profile alone could not. Custom hanging solutions are welded into the back of the frame to match the wall fixings on site, whether that is a French cleat, a security plate, or a set of integrated D-rings. This is the part of the build that gets specified most when a client is planning an installation, and we cover the practical considerations in our guide to things to consider for oversized artwork.

Finishes available on welded aluminium

Welded aluminium takes four finish families well:

Raw. Mill finish aluminium, the unfinished industrial look used for contemporary work and architectural pieces.
Anodised. A chemically converted surface, most often specified in black or silver. Anodised aluminium is durable, consistent across batches, and does not chip in the way paint does.
Painted. Sprayed finishes in any RAL colour, in matt, satin or gloss.
Brushed. A directional grain finish, often paired with anodising for durability. It reads as honest metal at close range and as a soft, even tone from across a room.

Finish choice affects price more than most clients expect; the cost section below explains how.

Size range and limitations

The workshop has completed welded frames up to 4.5m x 3.5m. There is no fixed lower limit. Welded construction is sometimes specified for smaller pieces purely for the aesthetic of a visible welded corner, where the visual statement of the joinery is the point. The practical upper limit at any given moment is set by transport, not by welding: the finished frame has to fit through the workshop door and onto whatever vehicle is delivering it. For projects that exceed that, we build in sections and weld the final corners on site.

Cost considerations

Welded aluminium picture frames at Harten start from around £500. The figure scales with four things: the size of the piece, the finish chosen (painted and gilded finishes are typically higher than raw or anodised), the structural requirement (an integral subframe for oversized work adds cost), and the glazing tier (museum-grade glazing on a 2m piece is a meaningful proportion of the total bill on its own). For a fuller breakdown of how custom framing is priced across all our formats, see our guide to custom framing costs.

Common use cases by sector

Welded aluminium frames are ordered by five recurring customer types, and the brief is different in each.

Artists. Face-mounted prints on dibond, large contemporary canvas work, mixed-media pieces where the frame is part of the structural solution rather than decoration. The brief is usually a thin, square profile in raw or anodised aluminium. We work directly with artists across the UK on this kind of work.

Galleries. Oversized works for exhibition, gallery walls of paired or sequenced pieces, and installation work that includes integrated security fittings. The brief here is consistency across a hang and the ability to engineer custom hanging solutions into the back of the frame. We cover this work in detail on our gallery framing service page.

Industrial and architectural artists. Work specified to a particular finish or scale, where the frame is part of the visual language of the piece. The welded corner is often visible and intentional, and the metal is part of the artwork, not just its housing.

Hospitality. Feature walls in hotel lobbies, restaurant interiors, and members-club projects. The brief is durability, even finish at scale, and clean lines that read well from across a room. Painted aluminium in matt or satin is the most common specification.

Trade framers. Other framing businesses across the UK that do not have welding capability in-house come to us for welded components on jobs that have outgrown their workshop. We supply the welded aluminium element, they finish the framing package.

Send us your dimensions

If you have an oversized or industrial-finish piece and you are weighing up whether a welded frame is the right answer, send us the dimensions of the work, a photograph if possible, and any finish requirements. We will quote on the right specification for the piece and explain the structural choice line by line. The framing carries our 5-year guarantee on the build. The full service detail sits on our welded picture frames service page.