assembly first establishes the geometric relationship, and tack welding is responsible for maintaining it
After the web and flange plate are cut, cleaned and dimensional inspected, they enter the assembly station according to the drawing number. The positioning rollers constrain the relative position of the panels, and the hydraulic pressure maintains the fit. The upper top wheel and the conveyor roller conveyor provide support. The panels pass through the tack welding area to form a transportable T-shaped or H-shaped component.
tack welding is used to maintain the assembly relationship and does not replace the main welding specified in the drawing. When the size, gap or misalignment is abnormal, the incoming materials should be checked and positioned first; the out-of-tolerance slats should not be temporarily locked and handed over to the next work station by increasing tack welding or forcibly pressing them.
The benchmarks for different beam types should be written on the process card
The constant-section beam is usually positioned according to the stable web and flange datum; the tapered-section beam needs to indicate the large and small ends, slope and feeding direction; the asymmetric beam needs to indicate the web offset and the upper and lower flange width and thickness difference. The workpiece datum cannot just write "centering", otherwise different references may be used for operation and inspection.
The split flange plate positioning structure in the assembly data can be positioned off-center within the allowable range, but the offset amount, clamping range and full-length transportation should still be checked picture by picture. The dead weight of the long beam, the bending of the incoming material and the height difference of the roller conveyor may also change the joint state during compression.
| Check object | Requires explicit conditions | Verification method |
|---|---|---|
| web location | Center or offset datum, endianness and direction | Measure at the agreed cross-section position according to the drawing |
| Flange position | Upper and lower flange distinction, width and overhang | Check board number, contact surface and assembly dimensions |
| Connector fit | Gap, misalignment and vertical relationship | Inspect before and after compression, and release according to process |
| Long beam support | roller conveyor elevation, load-bearing and feeding track | Slowly send the representative workpiece and observe the status |
Model filtering should retain respective parameters
TW-HAM2000, TW-HAM2500 and TW-HAM2500H are not only different in height, but also in plate thickness range. The following table lists the preliminary selection conditions based on the existing quotation data; the single extreme value is not a guarantee for any combination of processing, and the length, weight, straightness and positioning method of the panel must be matched.
| 參數 | TW-HAM2000 | TW-HAM2500 | TW-HAM2500H |
|---|---|---|---|
| 腹板高度 | 200–2000 mm | 200–2500 mm | 200–2500 mm |
| 腹板厚度 | 6–40 mm | 6–40 mm | 6–60 mm |
| 翼緣厚度 | 6–60 mm | 6–40 mm | 6–80 mm |
| 翼緣寬度 | 200–800 mm | 200–800 mm | 200–800 mm |
tack welding requires compliance with subsequent welding processes
The position, length, spacing, welding consumables and welding parameters of tack welding should be determined according to the subsequent WPS and workpiece conditions. The quality and starting and ending positions of the tack welding that needs to be melted by the main welding must be checked; defects that are not allowed to be retained should be dealt with according to regulations before main welding. The general process description on the web page cannot be regarded as the tack welding parameters of a certain joint.
After tack welding is completed, the joint should be checked for changes due to loosening or movement. The handling support, lifting position and turning plan must match the tack welding structure. Personnel cannot determine that any lifting conditions are met just based on the appearance of continuity.
According to the phenomenon, temporary remedies are not provided at the main welding station.
| 現象 | First check | Processing and review |
|---|---|---|
| Gap changes along length | Slat straightness, trimming and roller conveyor support | Process the incoming materials or supports first, and then retest the joints |
| web bias is unstable | Positioning reference, roller group settings and feeding status | Reset to same basis and inspect first article |
| Dimensional changes after loosening the clamp | Forced assembly, tack welding arrangement and support | Verification of tack welding workmanship and original deformation |
| tack welding hinders main welding | tack welding size, quality, position and subsequent welding | Process according to the approved process and feedback to the assembly station |
| Section offset after transfer | Lifting support, tack welding integrity and handling actions | Isolation review, verification after adjusting the transport plan |
Before handing over to the main welder, there should be clear release records
- The drawing number, material, plate batch and feeding direction are consistent, and ordinary and special beam types are marked respectively.
- The web position, flange extension, cross-sectional geometry, staggered edges and gaps meet the agreed requirements.
- tack welding The quality and the starting and ending sections that need to be processed have been checked, and the defects to be processed do not flow into the main welding.
- The transfer and turning method of the longest and heaviest workpiece has been confirmed.
- Inspection results, operation settings and exception handling follow the handover of the workpiece, and the first piece is re-verified after the changeover.
日期為本次預覽的擬定編輯排程，不代表過往實際發布日期。