Type
Box girders, plate girders and heavy plate parts
The single heavy member rather than the frame: a welded box girder, a plate girder with drilled flanges, a standing wall with a bored bearing seat, a long side plate with stiffeners and cut-outs, or a closed box section plated on every side. These are the parts that carry the load inside a larger assembly.
In the gallery the type runs from a box girder of four and a half metres to a plated box section over thirteen metres long.
What the drawing must show
A part like this is priced from the drawing. The quotation is fastest when it carries:
- The plate thicknesses and the material grade of each plate
- Camber or straightness, and the flatness of any machined face
- Hole patterns with their positions and tolerances
- Weld symbols on the flange to web joints, and the inspection level
- The finish, and the faces that stay bare
6 models of this type
Real structures that came through this company as built jobs, quoted enquiries or designs from our own office, shown as anonymous models with their measured size. Open one for its description.
- Overall size, L x W x H
- 13 620 x 2 551 x 2 800 mm
A long closed box girder, plated flush on every side with welded corner seams running the full length. A small bracket sits near one end on the top plate, with a cut opening nearby, the only break in the plain, continuous box form. It measures about 13.6 m long, 2.6 m wide and 2.8 m high. Pieces like this are tack welded on a fixture and welded out and welded on the robotic track or by hand.
- Overall size, L x W x H
- 6 020 x 420 x 1 165 mm
A plate girder built from a tall web plate between a drilled top and bottom flange running the full length, stiffened by vertical ribs on the back face. Small lifting tabs sit along the top edge, and end plates close off both faces. It measures about 6.0 m long, 0.4 m wide and 1.2 m high. A piece like this is laser cut up to 20 mm, tack welded on a fixture and welded out, with the bores and pads machined after welding.
- Overall size, L x W x H
- 4 550 x 261 x 1 069 mm
A welded steel box girder, built from plate into a long rectangular section with a stepped drop bracket, a downward lug, a bored web and a machined top face along part of its length. A notched fin at one end and a row of edge stiffeners stand out. It measures about 4.5 m long, 0.3 m wide and 1.1 m high. Such parts are welded by hand or on the 14 m robotic welding track, with every bore and pad cut after welding.
- Overall size, L x W x H
- 6 915 x 210 x 1 455 mm
A welded side plate forms a long edge-standing panel, with horizontal ribs across the back and short flange tabs folded along the top. Two rows of square cut-outs run the length for access and weight saving, with an arched cut-out near one end and bolt holes along both edges. It measures about 6.9 m long, 0.2 m wide and 1.5 m high. Pieces like this are laser cut up to 20 mm and welded on the robotic track or by hand.
- Overall size, L x W x H
- 2 410 x 206 x 2 364 mm
A welded standing wall built from one heavy steel plate on two slim support legs. The face carries a large machined bearing bore with a bolt circle, a small round boss, cut-out windows and short tabs, with curved stiffener ribs and a lifting eye at one corner. Overall size is about 2.4 m long, 0.2 m wide and 2.4 m high. A piece like this is laser cut from plate up to 20 mm and tack welded on a fixture and welded out.
- Overall size, L x W x H
- 3 534 x 896 x 541 mm
A machined side frame runs as a long slim weldment of plate and channel, with cross members, paired upright brackets along its length and a folded mounting plate at one end. The standout feature is a large bored ring opening at the other end, with a machined face around it and drilled lugs nearby. It measures about 3.5 m long, 0.9 m wide and 0.5 m high. Such parts are tack welded on a fixture and welded out, then machined after welding on a horizontal boring mill.
Each model is rendered from its own geometry in raw steel, without paint, and is shown as a still. Customer names, machine designations and drawing numbers are not published; part lists and files are not offered. The interactive model above this section is a parametric example, not one of these.
How a part like this goes through the hall
Plates up to 20 mm are laser cut on a 2 000 x 4 000 mm bed and longer webs are joined from more than one blank. Flanges are folded on the 400 t press brake where the section allows. The girder is welded out, straightened, and any bearing face is machined on a boring mill with up to 8 000 x 3 000 x 1 500 mm of travel. Blasting and painting follow in the booths on site.
Where this fits
Capabilities it runs through
Industries that order it
Notes from the blog
Other types in this group
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