Polygonal Stud Welding with Torque Verification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in stud welding is to effectively attach studs to increasingly thin body sheets without causing 'burn-through' and to ensure the strength of the welded joint, especially in vehicle technology, where the existing methods require high energy input and result in costly rework if defects occur.
Innovation Solution
A stud with a polygonal outer circumference and a uniform annular section designed for stud welding, allowing for a test torque to be applied to check the strength of the joint, reducing energy input during welding, and enabling early detection of defects before assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high energy input is used to fuse the conically tapering welding surface, then the welding strength is improved, but burn-through of the thin body sheet occurs
Solution Approach 1:
The welding surface is designed with non-uniform thickness: a thicker annular section at the periphery and a thinner central section. This local variation in geometry allows the thicker peripheral region to withstand higher energy input and provide structural strength, while the thinner central region facilitates controlled fusion without burn-through on thin body sheets.
Solution Approach 2:
The invention changes the geometric parameters of the welding surface from a conventional conical shape to a controlled geometry with specific thickness variations. By precisely controlling the thickness distribution (thicker annular section vs. thinner central section), the energy absorption and heat distribution during welding are optimized to prevent burn-through while maintaining weld strength.
2Weight of moving object
If the body sheet thickness is reduced to decrease vehicle weight, then the weight is reduced, but the welding process becomes more difficult and prone to burn-through
Solution Approach 1:
The stud welding element incorporates a thicker annular section specifically designed to interact with thin body sheets. This localized thickness increase at the welding interface provides sufficient structural integrity and energy absorption capacity even when welding onto very thin sheets (0.5-1.5 mm), enabling weight reduction without compromising manufacturability.
Solution Approach 2:
The welding surface geometry is pre-configured with the thicker annular section and thinner central section before welding. This preliminary geometric preparation ensures that during the welding process, the energy distribution is automatically optimized for thin sheet applications, eliminating the need for complex process adjustments and making welding of thin sheets as easy as thicker ones.
3Ease of manufacture
If a conventional stud design is used, then the manufacturing is simple, but the ability to check joint strength before assembly is lost
Solution Approach 1:
The stud welding element serves multiple functions: the thicker annular section provides structural strength and welding stability, while the polygonal outer circumference enables both welding and subsequent strength verification through torque application. This multi-functional design allows joint strength checking before final assembly without complicating manufacturing, as the same geometric features serve both welding and testing purposes.
Solution Approach 2:
The polygonal outer circumference is incorporated into the stud design from manufacturing, enabling preliminary strength verification to be performed before the stud is installed in the final assembly. This allows defective joints to be detected and replaced early, avoiding costly rework after painting and assembly, while requiring no additional manufacturing steps.
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
This design allows for cost-effective stud welding on very thin sheets with reduced risk of burn-through and enables the detection of defective joints during the body-in-white phase, avoiding expensive rework and ensuring the strength of the welded joint.
Implementation Method 1
In order to fuse this surface during the stud welding, a relatively high input of energy is required
Implementation Method 2
The front, radially extending annular surface is designed as a welding surface which is to be welded to a workpiece
Implementation Method 3
The stud is then pulled back for forming an arc
Implementation Method 4
a relatively high input of energy is required
Data Source
AI summary
A method of welding a weld stud to a workpiece and of checking the strength of the welded joint includes the steps of providing a tool, a workpiece, and a weld stud, the weld stud including a shank and a polygonal shaped head; welding the weld stud onto the workpiece; applying the tool to the polygonal shaped head section of the stud; applying a predetermined test torque to the weld stud with the tool; and checking the welded joint for satisfactory acceptance of the test torque.