Plastic Welding Gun Using Conductive Wire for Strong Joints
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Solution Overview
Problem
Conventional methods for joining plastics, such as glues and heat-based welding tools, face issues with residual stress, surface deformation, and high operational costs, and the repaired joints often have lower strength and durability compared to the plastics themselves.
Innovation Solution
A welding gun with a simple structure comprising a main body, power cord, power controller, transformer, and welding tubes, which uses a conductive welding wire to convert electric energy into thermal energy for instant melting and embedding into plastics, reinforcing the joint strength by embedding the wire's connecting portion within the plastics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional jointing tools (contacting, heated air, high frequency, or supersonic) are used to weld plastics, then the combining strength is improved and cracks are prevented from re-damaging, but displacement, surface deformation, distortion and residual stress occur
Solution Approach 1:
The patent replaces conventional mechanical or thermal welding systems with an electrical resistance welding system. The welding wire (60) serves as a self-heating element that converts electrical energy directly into thermal energy at the welding point, eliminating the need for external heating devices, contact pressure mechanisms, or vibration systems. This substitution resolves the technical contradiction by achieving strong bonding without the displacement and surface deformation caused by mechanical contact and external heating.
Solution Approach 2:
The welding wire (60) functions as a self-service heating element by converting electrical energy directly into thermal energy through its own electrical resistance. The wire heats itself at the welding point without requiring external heating devices, and the molten wire material automatically fills and bonds the crack. This self-service mechanism eliminates the need for complex external heating and pressure application systems, thereby preventing surface deformation and distortion while achieving strong combining strength.
2Strength
If conventional jointing tools are used to weld plastics, then the combining strength is improved, but the operation becomes complicated and costs increase
Solution Approach 1:
The patent replaces complex mechanical welding equipment (heated air guns, ultrasonic devices, high-frequency generators) with a simple electrical resistance welding system. The welding gun (100) contains only basic electrical components (transformer, welding wire, simple controls) that are much easier to operate. The welding process requires only electrical power input, eliminating the need for complex mechanical adjustments, temperature controls, or vibration settings, thereby reducing operational complexity and cost while maintaining strong bonding.
Solution Approach 2:
The patent extracts the heating function from complex external heating devices and concentrates it into the simple welding wire (60) that serves as a self-heating element. By taking out the heating function and embedding it directly in the welding consumable, the system eliminates the need for complex external heating equipment and reduces operational complexity to basic electrical control, while still achieving the required combining strength.
3Reliability
If glues or adhesives are used to seal cracks in plastics, then the cracks are sealed initially, but the sealed cracks may damage again after serving for a certain period of time due to different abrasion rates
Solution Approach 1:
The patent uses the welding wire (60) material to fill and bond the crack, ensuring that the repair material has the same abrasion rate and physical properties as the surrounding plastic structure. This homogeneity between the welding wire material and the plastic substrate ensures uniform wear characteristics, preventing the repair area from deteriorating faster than the original structure and thereby extending the service life of the repaired component.
Solution Approach 2:
The patent creates a composite structure where the welding wire material and plastic substrate are fused together through electrical resistance welding. The molten wire material penetrates and bonds with the plastic, forming a strong composite joint that combines the properties of both materials. This composite structure provides superior durability and matching abrasion characteristics compared to adhesive bonding, extending the service life of the repaired crack.
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 solution provides a strong, durable, and cost-effective method for joining plastics with reduced risk of re-damage, eliminating displacement and surface deformation issues while maintaining the strength of the plastics.
Implementation Method 1
the welding wire can convert electric energy into thermal energy that can instantly melt interface of two pieces of plastics
Implementation Method 2
the welding wire can convert electric energy into thermal energy that can instantly melt interface of two pieces of plastics, so that the welding wire can be embedded in the plastics
Data Source
AI summary
A welding gun of plastics includes a main body, a power cord, a power controller, a transformer and two welding tubes. Each welding tube has one end fixed in the main body and another end formed with a plugging hole extended outward the main body for a pin of a welding wire to plug in. The welding wire can be electrified to create thermal energy that is able to instantly melt the interface of two pieces of plastics, enabling the welding wire to be embedded in plastics so as to reinforce fusing strength.