Custom Door Subassemblies
Door subassemblies arrive as one part on one part number: sectional door brackets, mounting plates, and reinforcement channels already joined. K-Display welds them in carbon steel or aluminum sheet from your assembly drawing and bill of materials.
Welded door units
We build the joined units of a sectional door: a mounting plate with its brackets, its reinforcement channel, or both welded on. The parts are laser cut and formed from carbon steel or aluminum sheet, MIG or TIG welded, fitted with self-clinching nuts and studs, powder coated, and marked left and right.
Brackets and plates supplied loose are garage door components, and a channel spot welded to a door skin is one of the sectional door panel components.
The drawing shows one bracket riveted to the plate beside its channel, and a second bracket still loose. A joined bracket is fixed to the plate as part of the unit; a loose one is a separate part.
Door subassemblies we build
- Bracket-and-plate units
- One or more formed brackets welded to a mounting plate at the door section's hole pattern.
- Plate-and-channel units
- A mounting plate with a reinforcement channel welded across it behind the hardware location.
- Bracket, plate, and channel units
- A mounting plate carrying both the channel and its brackets.
Weld access, fit-up, and hand
- Weld access
- A torch cannot reach a joint that a nearby bracket already shadows, and the shadowed joint ends up short of a full weld.
- Datum fit-up
- The bracket and the channel each locate from the plate's hole pattern. Fit them to different datums and the finished unit carries two hole sets that no longer agree.
- Hand
- Left and right units are mirror images. A bracket welded on the wrong edge makes a unit that looks right and mounts only on the other side of the door.
Hardware in before the coat
Self-clinching hardware goes into the welded unit before the coat, so its threads are masked to keep the powder out.
Cut, form, and fit up
We laser cut and form the plate, brackets, and channel, then fit them together on the plate's hole pattern.
Weld and fit hardware
We MIG or TIG weld the joints, then install self-clinching nuts and studs.
Mask, coat, and mark
We mask the nut and stud threads, powder coat the unit, and mark each one L or R.
Show the unit at its next assembly step
Keep the bracket attached to its plate when showing the next assembly step. In this example, the seated rivets belong to the supplied unit; only the screws that connect it to the door panel are shown separately. That distinction makes the handoff visible without taking the subassembly apart.
Place the unit beside its mating face in the same orientation it will occupy when fitted. This view helps distinguish the joints already completed from the connections still to make. The assembly drawing defines the actual fasteners and supplied state.
The seated rivets identify the joints completed before delivery; the separate screws identify the next connection. Showing the bracket still attached to its plate makes the supplied assembly state clear to the receiving team.
What to send for a door subassembly quote
- Assembly drawing
- Joint locations, whether each joint is welded or riveted, and the current revision.
- Bill of materials
- Part numbers for brackets, plates, channels, and hardware, with quantity per unit.
- Finish
- Powder color and gloss, with the threads and faces to mask.
- Identification and packing
- Hand marks, label content, and how units are packed.
- Volume
- Quantity per part number and repeat demand.