Dual Contact Tip Wire Preheating for Consistent Weld Starts
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Solution Overview
Problem
Current welding techniques lack a systematic approach to ensure the electrode is heated before initiating a welding operation, which can affect the quality and consistency of welds.
Innovation Solution
A welding system that includes a contact tip assembly with electrically isolated contact tip portions, where a preheat current is supplied to heat the electrode wire, and a welding current is supplied to maintain the welding arc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cold electrode start is used, then the welding system is simpler to operate, but the weld initiation quality is inconsistent
Solution Approach 1:
The system applies preliminary action by heating the electrode wire to a predetermined temperature before welding arc initiation. A preheat power supply activates the contact tip assembly to raise the electrode temperature in advance, ensuring consistent weld initiation while maintaining ease of operation through automated temperature control.
2Manufacturing precision
If a hot electrode start is used, then the weld initiation quality is improved, but the device complexity increases
Solution Approach 1:
The system segments the power supply function into two independent components: a welding power supply and a preheat power supply. The contact tip assembly is also segmented into multiple contact tips that can be selectively activated. This segmentation allows the preheat function to be added without redesigning the entire welding system, thus improving weld initiation quality while limiting device complexity through modular architecture.
Solution Approach 2:
The contact tip assembly serves multiple functions: it acts as both a welding current conductor and a preheat element. The same contact tip structure is used for both normal welding operations and preheating operations, eliminating the need for separate heating devices and reducing overall system complexity while achieving improved weld initiation.
3Stability of the object's composition
If a preheat current is supplied through a dual contact tip assembly, then the electrode temperature consistency is improved, but the device complexity increases
Solution Approach 1:
The system uses self-service by utilizing the electrode wire's own electrical resistance as the heating element. When preheat current flows through the contact tip assembly, the electrode wire heats itself through resistive heating without requiring external heating sources. This eliminates the need for complex external heating mechanisms while achieving consistent electrode temperature through the naturally occurring Joule heating effect.
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 system ensures a consistent preheated electrode, improving weld initiation and overall welding performance by maintaining a heated electrode throughout the welding process.
Implementation Method 1
a preheat power supply that activates the contact tip assembly to raise the electrode temperature to a predetermined temperature
Implementation Method 2
a welding power supply that generates and maintains a welding arc
Data Source
AI summary
A contact tip assembly with a preheating tip comprises a welding-type power source configured to provide welding-type current to a welding-type circuit, the welding-type circuit comprising a welding-type electrode and a first contact tip of a welding torch; an electrode preheating circuit configured to provide preheating current through a first portion of the electrode via a second contact tip of the welding torch; and a preheat controller to: monitor a voltage drop across a second portion of the electrode; adjust at least one of the welding-type current or the preheating current based on the voltage drop, the second portion of the electrode comprising at least part of the first portion of the electrode; and control the preheating current based on a hydrogen reduction goal and based on stored parameters associated with a type of the electrode, a chemistry of the electrode, or a wire size.