Steel structure manufacturer since 2009 · 8 fabrication bases in China
Primary Steel
Welded H-beams and plate girders, sized for the load instead of the catalogue
Rolled sections stop at fixed sizes. A welded section lets the engineer choose flange and web separately, taper the depth and put steel only where the moment is. The price of that freedom is welding, and the welds are where the checks go.
200–2,000 mm
Web depth
6–80 mm
Plate thickness
Tapered
Portal rafters and columns
SAW
Automatic flange welds
Selection
Rolled section or welded H?
| Condition | Rolled H / I | Welded H / plate girder |
|---|---|---|
| Standard sizes, short lead time | Better | Longer lead time |
| Deep beams over about 900 mm | Not available | Standard |
| Tapered portal rafters | Not possible | Standard |
| Heavy transfer and crane girders | Limited | Better |
| Unit cost per ton, small sizes | Lower | Higher |
| Weight on long spans | Fixed | Steel only where needed |
Flange-to-web welds
Fillet or full penetration?
Your engineer decides. These are the usual reasons for each choice.
| Weld | When used | Testing |
|---|---|---|
| Double fillet by SAW | Most beams, columns and rafters | Visual 100%; MT on sample per ITP |
| Partial penetration | Thick webs with moderate shear | Visual; UT where specified |
| Full penetration (CJP) | Crane runway girders, fatigue-loaded members, high shear | UT 100% for grade 1 welds per GB 50205; AWS D1.1 / EN 1090-2 as specified |
Crane girders: the top flange-to-web weld carries every wheel pass. Specify CJP or a fatigue-rated fillet, and tell us the crane class.
Capabilities
What we fabricate
| Parameter | Range | Notes |
|---|---|---|
| Web depth | 200–2,000 mm | Constant or tapered |
| Flange width | 150–800 mm | Unequal flanges possible |
| Plate thickness | 6–80 mm | Z15/Z25/Z35 where loaded through thickness |
| Length per piece | Up to 18 m | 11.8 m for 40HQ shipping |
| Web openings | Round, rectangular, castellated | Reinforced per design |
| Camber | Cut into the web profile | Checked on the floor |
| Grades | Q235B, Q355B–D, Q390, Q420; S355; A572 Gr50 | EN 10204 3.1 certificates |
From our engineers
Four details to settle on the drawings
Stiffeners. Slender webs need bearing stiffeners at supports and point loads. Missing stiffeners are the most common query we raise.
Camber. State the camber and the load it is for. Camber is cut into the web, not forced in afterwards.
Web openings. Holes for ducts weaken the web. Positions should be fixed before cutting; late holes need reinforcement and approval.
Splices. Long girders are split for shipping. Splice at low moment; bolted splices avoid site welding.
Process
How a welded beam is made
01
Cut plates
CNC flame or plasma; web profile cut for taper or camber.
02
Assemble H
Flanges and web tacked on an assembly line.
03
SAW welding
Submerged arc, balanced to limit distortion.
04
Straighten
Flange tilt corrected by roller straightener.
05
Fit-up
End plates, stiffeners and cleats welded.
06
Inspect
Dimensions and NDT per the ITP.
Tolerances
Typical limits
Per GB 50205 or EN 1090-2, whichever your specification names. Tighter limits on request, priced as such.
| Item | Typical limit |
|---|---|
| Depth | ±3 mm |
| Flange tilt | b/100, max 3 mm |
| Web out-of-flatness | d/150 |
| Sweep | L/1000, max 10 mm |
| Length | ±3 mm |
Can you match a rolled section with a welded one?
Yes, but it usually costs more. Welded sections pay off where rolled sizes do not fit the load.
Do you make castellated beams?
Yes, by cutting and re-welding rolled or welded sections; your engineer checks the web posts.
Fillet or full-penetration flange welds?
Fillet is standard. CJP where your design or fatigue requires it.
What is the lead time?
Typically 2–4 weeks after shop drawing approval for a few hundred tons.
Beam schedule
Send the schedule and we price per mark
Sections, lengths, quantities, connections, grade and any crane loads.