Plasma Torch Multi-Height Piercing for Thick Workpiece Penetration
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Solution Overview
Problem
Conventional plasma torch piercing methods face challenges in penetrating thick workpieces while protecting consumables from heat and slag reflection, often requiring elevated piercing that can hinder complete penetration or cause damage.
Innovation Solution
A method involving multiple pierce heights and adjustable arc process parameters, including shield fluid and plasma gas, combined with horizontal movement, to ensure complete penetration and reduce consumable damage during piercing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piercing is completed at an elevated position to protect the torch from heat and slag reflection, then consumable damage is reduced, but complete penetration of thick workpieces cannot be achieved
Solution Approach 1:
The patent applies dynamics by transitioning the torch from a static elevated position to a dynamic lowering motion during the piercing process. The torch is initially positioned at an elevated first pierce height to initiate piercing, then lowered to a second lower pierce height to complete penetration through thick workpieces, and finally lowered to cut height. This dynamic position adjustment allows the system to achieve both consumable protection during initiation and complete penetration during completion.
2Manufacturing precision
If the torch is dropped to cut height before complete penetration to enable thick workpiece piercing, then penetration is achieved, but heat and slag blowback damages the torch front end and consumables
Solution Approach 1:
The patent applies preliminary action by initiating the piercing operation at an elevated first pierce height before lowering the torch. This preliminary piercing phase creates an initial opening and establishes plasma arc stability, allowing the subsequent lowering to cut height to occur safely without causing blowback damage. The preliminary action at elevated position prepares the system for the final penetration phase.
3Manufacturing precision
If multiple re-ignition processes are used during piercing to maintain arc through thick material, then penetration can be achieved, but consumable wear increases and time is consumed
Solution Approach 1:
The patent applies continuity of useful action by maintaining the plasma arc continuously throughout the entire piercing process. The torch remains ignited during the transition from the first pierce height to the second pierce height and through the final lowering to cut height. This continuous arc operation eliminates the need for multiple re-ignition processes, reducing both consumable wear and operation time while achieving complete penetration of thick workpieces.
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
Enables complete penetration of thicker workpieces while extending consumable lifespan and reducing piercing time, avoiding re-ignition wear and minimizing damage to plasma torch components.
Implementation Method 1
a plasma arc torch and its associated power supply configured to provide a piercing current to the plasma arc torch
Implementation Method 2
the power supply may be configured to provide a lead-in current prior to the piercing current, and to maintain an arc between the plasma arc torch and the workpiece
Implementation Method 3
By varying arc process parameters in combination with, or proximate to, adjusting the pierce height, present embodiments may similarly extend the lifespan of consumables
Data Source
AI summary
A method, apparatus, and computer program product are provided for plasma piercing a workpiece using a plasma cutting torch. According to one implementation the method includes providing the plasma cutting torch at a first pierce height above a workpiece to initiate a piercing operation at the first pierce height for a first duration, during the piercing operation, lowering the plasma cutting torch to a second pierce height above the workpiece for a second duration, and lowering the plasma cutting torch to a cut height.