Arc Welding Mode Switching for Stable Droplet Transfer
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Solution Overview
Problem
Conventional arc welding methods experience instability and spatter generation when switching between pulse arc welding and short-circuit transfer arc welding due to inadequate droplet transfer mechanisms.
Innovation Solution
The method involves a welding power supply system with precise control over feeding speed and direction, using a combination of forward and reverse feeding patterns during short-circuit transfer arc welding periods, and switching to pulse arc welding during arc periods to ensure stable droplet transfer and prevent spatter formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional arc welding methods switch between pulse arc welding and short-circuit transfer arc welding, then welding appearance and heat input control are improved, but welding state stability deteriorates due to spatter generation during switching
Solution Approach 1:
The invention performs preliminary action by forming a droplet during the pulse arc welding period before switching to short-circuit transfer arc welding. The droplet formation is initiated in advance during the arc period, and the short-circuiting action is then executed to transfer the pre-formed droplet. This preliminary droplet formation ensures that when switching occurs, a stable droplet is already prepared, preventing spatter generation and maintaining welding state stability while preserving the benefits of alternating welding modes for appearance quality and heat input control.
2Adaptability or versatility
If droplet transfer is caused by different modes for pulse arc welding and short-circuit transfer arc welding, then each mode can be optimized independently, but switching between modes generates spatters and destabilizes the welding state
Solution Approach 1:
The invention merges the droplet transfer mechanism of pulse arc welding and short-circuit transfer arc welding into a unified process. During the pulse arc welding period, droplet formation is initiated, and this formation process continues and completes during the short-circuit transfer arc welding period. By combining the droplet formation phase from pulse arc welding with the transfer phase from short-circuit transfer, the invention creates a seamless droplet transfer mechanism that eliminates spatter generation during mode switching while maintaining the adaptability and versatility of using different welding modes for optimized welding results.
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 enables smooth switching between welding modes, stabilizing the welding state and reducing spatter occurrence by ensuring a droplet is formed and transferred smoothly during short-circuiting, thereby improving the overall welding process.
Implementation Method 1
arc welding method in which welding is performed by alternately switching between two kinds of periods, i.e., a period for pulse arc welding and a period for short-circuit transfer arc welding
Implementation Method 2
a droplet of molten wire is transferred by the pulse arc welding
Data Source
Figure 1
Figure 2(A)~2(F)
Figure 3(A)~3(F)
AI summary
An arc welding method includes: performing pulse arc welding with a welding wire being fed in a forward direction during a first period; performing short-circuit transfer arc welding with the welding wire being fed in the forward direction and a reverse direction during a second period; and alternately switching between the first period and the second period. The switching of the first period to the second period is performed during a peak period of the pulse arc welding.