Laser-Textured Welding Wire Drive Rolls for Low-Pressure Feeding
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Solution Overview
Problem
Cored and soft metallic welding wires deform under high clamping pressure in traditional drive rolls, leading to feeding issues and burr formation, which can wear out welding torch liners, and require specialized tooling for knurling.
Innovation Solution
Pulsed laser etching is used to create craters on the sidewalls of drive roll grooves, providing friction without deforming the wire and reducing burr formation, while requiring less tooling than knurling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high clamping pressure is applied to drive solid welding wires, then reliable wire feeding is achieved, but cored and soft metallic wires deform and crush
Solution Approach 1:
The drive roll groove is given a knurled surface finishing with increased friction coefficient only in the specific contact area where the wire passes, while the rest of the drive roll maintains its original properties. This localized friction enhancement allows reduced clamping pressure to achieve the same driving effect, preventing wire deformation while maintaining feeding reliability.
Solution Approach 2:
The surface friction coefficient of the drive roll groove is changed from a smooth finish to a knurled finish with higher friction. This parameter change in surface texture allows the system to transmit sufficient driving force at lower clamping pressures, thereby preventing wire crushing while maintaining reliable feeding.
2Shape
If knurled grooves are used to reduce clamping pressure for cored and soft wires, then wire deformation is prevented, but burrs are raised on the wire surface
Solution Approach 1:
The knurled surface finishing is applied locally to the groove area only, with controlled depth and pattern density. This localized treatment provides necessary friction while minimizing mechanical interaction that could raise burrs on the wire surface, balancing wire shape preservation with surface quality.
Solution Approach 2:
Instead of applying excessive knurling depth that would definitely raise burrs, a partial knurled pattern with optimized parameters is used. This partial action provides sufficient friction to reduce clamping pressure needs while staying below the threshold that causes significant burr formation on the wire.
3Force
If knurling is applied to drive roll grooves to provide friction, then wire feeding at lower pressure is achieved, but specialized tooling is required
Solution Approach 1:
The traditional mechanical knurling process requiring specialized tooling is replaced with a laser-based surface treatment process. The laser creates the knurled pattern through optical energy, eliminating the need for complex mechanical tooling while achieving the same friction-enhancing surface texture on the drive roll groove.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The surface finishing with pulsed laser etching allows for reliable wire feeding at lower clamping pressures, minimizing wire deformation and burr formation, and simplifies the tooling process, enhancing the handling and performance of welding wire drive rolls.
Implementation Method 1
Pulsed laser etching is used to create craters on the sidewalls of drive roll grooves
Data Source
Figure 1~3
Figure 4~7
Figure 8
AI summary
A welding wire drive roll (100) has an outer circumferential surface having a circumferential groove (106, 108, 113) projecting radially inward from the outer circumferential surface. The circumferential groove (106, 108, 113) is formed by a first sidewall having a first sidewall surface, a second sidewall having a second sidewall surface, and a groove base (112) extending between the first sidewall and the second sidewall. The first sidewall surface includes a first surface finishing comprising a first ring of laser-formed craters (114) along the first sidewall surface. The second sidewall surface includes a second surface finishing comprising a second ring of laser-formed craters (114) along the second sidewall surface.