What Longitudinal Seam Welding Means in Heavy Steel
Longitudinal seam welding in heavy steel means controlled continuous welding along beams, box sections, pipe shells, or built-up members. Honglu Group treats the seam as a production-control object tied to model data, WPQ/WPS, and inspection, not as a loose shop-floor pass.
| Seam context | Honglu route |
|---|---|
| Box columns | HLZZHJ-R-QJLX-12M SAW workstation |
| H-beams | HLZZHJ-R-QJLX-12 rail-guided workstation |
| Steel pipe | JCOE Steel Pipe Line |
| Surface prep | Q1525-10 pass-through shot blasting |
This routing keeps seam welding connected to geometry, material, and certified acceptance.
When an Automatic Seam Welding Machine Should Use SAW
An automatic seam welding machine should use submerged arc welding when thick structural members require root, filling, and cover passes. Honglu’s floor-mounted rail-guided submerged arc welding workstation is published for box columns, H-beams, cross-shaped columns, and full-penetration thick-plate welds.
| Verified SAW data | Value |
|---|---|
| Model | HLZZHJ-R-QJLX-12M |
| Fleet | 200 units |
| Rail | 12,000 mm |
| Effective stroke | 10,130 mm |
| Power supply | Megmeet SA1250R |
The workstation uses Honglu MP1000BM vision and SW-iAPP-01 control software for repeatable seam execution.
How Gantry Welders Extend Seam-Welding Capacity
Gantry welders extend seam-welding capacity when long straight structural seams exceed the task profile of compact robot cells. Honglu’s equipment catalogue lists two verified automatic gantry systems for high-volume structural welding.
| Equipment | Model | Units | Verified fact |
|---|---|---|---|
| Double-Arc Double-Wire Gantry Welder | LMZ-1800-S | 200 | full-penetration ≤25 mm web without beveling; 2× single-wire speed |
| T-Type Gantry Automatic Welder | TMZ-2000-S | 65 | Chengdu Huayuan double-arc double-wire system |
These machines sit inside the same certified Honglu production base as robotic workstations and CNC cutting systems.
What Seam Welding Equipment Must Measure
Seam welding equipment must measure geometry, path, weld procedure, and final acceptance. Honglu’s robot technology stack uses model-driven welding from STEP, IGS, and IFC data, then extracts weld seams, matches parameters, plans trajectory, and runs full-path collision detection.
- Positioning inputs: wire contact positioning, laser non-contact positioning, laser scanning, laser tracking, and arc tracking.
- Weld behavior: root pass, filling pass, cover pass, intermittent welding, and fish-scale welding.
- Acceptance terms: full-penetration weld, Grade 1 weld, NDT/UT, and ISO 3834.
This is the technical basis for automated seam welding in structural steel.
Why Seam Welding Links to Cutting and Surface Prep
Seam welding links to cutting and surface prep because fit-up, beveling, marking, and Sa2.5 cleaning determine weld readiness. Honglu’s CNC fiber laser cutting machine uses LNC nesting/control software, Raycus MFMC-20000W source, and a 3D 5-axis Gangchun cutting head for beveling.
| Upstream control | Verified Honglu fact |
|---|---|
| Cutting patent | CN202211192872.3 |
| BIM QR scanning patent | CN202111056156.8 |
| Shot blasting | Q1525-10, Sa2.5 per GB/T 8923 |
| Smart manufacturing reference | Honglu smart upgrades |
Seam quality starts before the arc starts, and Honglu’s factory routing makes that dependency explicit.