Arc Welding Pulse Control for Thin-Plate Burn-Through Reduction
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Solution Overview
Problem
Increasing welding current to enhance speed can lead to defective welds and burn-through in thin plates, while lowering voltage to prevent these issues increases short circuit duration and spattering.
Innovation Solution
An arc welding method and device that alternately generate short-circuit and arc states by applying specific current profiles, including a first current with a peak higher than the short circuit release current and a second current lower than the arc state current, within a composite arc period, to manage short circuits and arcs effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If welding current is increased to enhance welding speed, then productivity is improved, but burn-through and defective welds occur in thin plates
Solution Approach 1:
The patent applies periodic pulsed current instead of continuous current, creating alternating short-circuit and arc periods. This periodic action allows the welding process to cycle between high current (for penetration) and low current (for control), enabling thin plate welding at high speeds without burn-through by preventing sustained excessive heat input
Solution Approach 2:
The patent dynamically changes current parameters by applying different current levels during different phases: high peak current during short-circuit period for rapid melting and penetration, and reduced current during arc period for controlled deposition. This parameter modulation resolves the contradiction between speed and quality
2Reliability
If welding voltage is lowered to prevent burn-through, then weld quality is improved, but short circuit duration increases and spattering occurs
Solution Approach 1:
By implementing periodic pulsed current with distinct short-circuit and arc periods, the system maintains low average voltage to prevent burn-through while using periodic high current peaks to reduce spattering. The rhythmic current variation prevents the sustained low-voltage condition that causes excessive spattering
Solution Approach 2:
The patent applies preliminary current reduction before the short circuit is released, and uses the periodic pulse structure to counteract the tendency toward spattering. The controlled current timing preemptively prevents the conditions that lead to excessive spatter while maintaining weld quality
3Object-generated harmful factors
If conventional pulse control is used with standby state during short circuit, then spattering is reduced, but welding speed is limited
Solution Approach 1:
The patent implements continuous periodic pulsing without standby states, eliminating idle time between pulses. The rhythmic alternation between short-circuit and arc periods maintains continuous productive action, doubling the effective number of short circuits per unit time compared to conventional methods with standby periods
Solution Approach 2:
The patent eliminates the standby state in conventional pulse control, ensuring continuous useful action throughout the welding process. The pulsed current continues without interruption, with each pulse contributing to welding progress, thereby maximizing productivity while maintaining spatter control through the periodic structure
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 approach more than doubles the number of short circuits, allowing for high-speed welding of thin plates with reduced burn-through and minimized spattering.
Implementation Method 1
an arc welding method in which a welding wire as a consumable electrode is fed in alternating forward and backward directions to generate a short-circuit state and an arc state alternately
Data Source
AI summary
An arc welding method alternately generates a short-circuit state and an arc state. In the method, short circuits are generated also in the arc period. This more than doubles the total number of short circuits, which is the sum of the short circuits generated in the short circuit period and those generated in the arc period. This enables a thin plate to be arc welded at a higher speed, while reducing its burn-through.