Arc Welding Weaving Control for Mixed Heat Capacity Joints
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Solution Overview
Problem
Arc welding of members with different heat capacities often results in burn-through or insufficient penetration due to mismatched heat input, particularly when using pulse welding on thinner materials.
Innovation Solution
An arc welding method involving a consumable electrode where the welding torch moves in a weaving motion across the boundary between members, alternating between short-circuit welding on the thinner member and pulse welding on the thicker member, with controlled switching of welding modes and currents to manage heat input effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pulse welding is used on a member with smaller plate thickness, then penetration depth is improved, but burn-through occurs and joining quality deteriorates
Solution Approach 1:
The patent applies different welding methods to different members based on their local characteristics (heat capacity, plate thickness). Short-circuit welding is used for members with smaller heat capacity to prevent burn-through, while pulse welding is used for members with larger heat capacity to ensure sufficient penetration. This localized adaptation of welding parameters resolves the contradiction between achieving penetration and preventing burn-through.
Solution Approach 2:
The patent dynamically switches between short-circuit welding and pulse welding modes during the welding process. The welding method is not fixed but changes in real-time based on which member (first or second) the welding torch is currently processing. This dynamic adjustment allows the system to optimize penetration depth while preventing burn-through by adapting the welding characteristics to the current workpiece requirements.
2Reliability
If short-circuit welding is used on a member with larger heat capacity, then burn-through is prevented, but penetration depth becomes insufficient
Solution Approach 1:
The patent matches the welding method to the local heat capacity characteristics of each member. For members with larger heat capacity, pulse welding is selected to provide sufficient penetration, while for members with smaller heat capacity, short-circuit welding is used to prevent burn-through. This localized matching ensures both adequate penetration and prevention of burn-through by selecting the appropriate welding mode for each specific workpiece.
Solution Approach 2:
The system dynamically selects and switches between welding modes based on real-time identification of which member is being welded. When the welding torch processes the first member (smaller heat capacity), short-circuit welding is activated; when processing the second member (larger heat capacity), pulse welding is activated. This dynamic mode selection ensures optimal penetration depth while preventing burn-through for each member type.
3Stability of the object's composition
If weaving motion is used to weld members with different heat capacities, then uniform heat distribution is improved, but welding process complexity increases
Solution Approach 1:
The patent employs periodic weaving motion of the welding torch that alternates between the first and second members. This periodic movement creates a cyclical pattern of heat input that distributes thermal energy more uniformly across both members with different heat capacities. The regular oscillation of the torch prevents heat concentration in one location while maintaining adequate heat input for both workpieces, achieving uniform heat distribution through rhythmic motion.
Solution Approach 2:
The welding torch performs dynamic weaving motion that continuously adjusts its position between the first and second members. This dynamic movement, combined with real-time switching between short-circuit and pulse welding modes, creates a complex but controlled welding process. The system coordinates the physical motion of the torch with the electrical welding parameters to achieve uniform heat distribution while managing the increased process complexity through automated control.
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 method improves the quality of joining by reducing burn-through on thinner members and ensuring proper penetration on thicker members, achieving desired penetration depths without damage, while also reducing costs by eliminating the need for additional AC units in DC welding.
Implementation Method 1
generating an arc between the welding wire and the welding target
Implementation Method 2
a pulsed welding current alternating between the peak current and the base current is applied to a welding wire and a welding target
Data Source
AI summary
A second member has a larger heat capacity than a first member. Welding is conducted while moving a welding torch in a weaving motion so that the welding torch crosses a boundary position between the first member and the second member. During the weaving motion, the first member is subjected to first welding and the second member is subjected to second welding. The first welding includes at least the short-circuit welding. The second welding includes at least the pulse welding.