Brazed T-Joint Tubing with Support Flange to Prevent Burn-Through
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Solution Overview
Problem
Traditional methods of welding light gage tubing or pipe in a perpendicular T-joint often result in 'blowing a hole' due to the sharp edges created by traditional cope or saddle cuts, requiring high skill levels to prevent material burn-through and failing to meet the 3T rule for brazing applications.
Innovation Solution
A method and system that form a saddle or cope joint with a support section flange and a planar filler material, increasing the surface area and reducing sharp edges, allowing for successful welding even by less skilled welders and meeting the 3T rule by ensuring at least three times the surface contact as the thinnest portion of the tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional cope or saddle cuts are used to join tubing, then the joint can be formed, but sharp edges are created that accelerate heating and cause burn-through
Solution Approach 1:
The tubing end is pre-formed with a coped or saddled configuration that includes a flattened surface and rounded edges before the welding process begins. This preliminary shaping eliminates sharp edges that would otherwise accelerate heating and cause burn-through during welding.
Solution Approach 2:
The end of the tubing is given a different local geometry than the rest of the tube - specifically a flattened surface with rounded edges in the coped or saddled region. This localized quality change creates a larger, more uniform heating surface that prevents concentrated heat buildup at sharp edges.
2Ease of operation
If traditional welding methods are used on light gage tubing, then welding can be performed, but high skill level is required to prevent blowing holes
Solution Approach 1:
The tubing is pre-prepared with coped or saddled end conditions that include flattened surfaces and rounded edges before welding. This preliminary action creates optimal heating characteristics that reduce the skill level required and increase reliability by preventing blow-holes during the welding process.
Solution Approach 2:
The geometry of the tubing end is changed from a sharp circular edge to a flattened surface with rounded edges. This parameter change in the physical configuration creates more uniform heat distribution, making the welding process more forgiving and reliable for operators of varying skill levels.
3Ease of manufacture
If traditional joints are used, then the joint can be formed, but the 3T rule for brazing is not met
Solution Approach 1:
The coped or saddled end condition transforms the one-dimensional circular edge of the tubing into a two-dimensional flattened surface with extended area. This dimensional change creates sufficient surface contact area to meet the 3T rule requirements for brazing applications.
Solution Approach 2:
The end of the tubing is given a specialized local geometry with flattened surface and extended area in the coped or saddled region. This localized quality enhancement provides the necessary surface contact area to satisfy the 3T rule precision requirement for brazing.
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 method reduces the risk of burn-through, lowers the skill requirement for welding, and ensures strong, reliable joints that meet or exceed brazing standards by providing a thicker surface area and proper heat distribution during the welding process.
Implementation Method 1
heating the filler material
Implementation Method 2
heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material
Implementation Method 3
creates a thicker surface that works as a support for traditional arc welding on lighter gage materials to prevent 'blowing a hole'
Data Source
AI summary
The disclosed apparatus, systems and methods relate to the design principles for forming a welded joint between two sections of tubing or pipe. The material at the end portion of a first section of tubing to is folded inwardly to create a support surface. This support surface improves the ability to weld light gage material with traditional arc welding and it creates conditions to allow brazing to be as strong as traditional arc welding by using A shaped piece of filler material which is located at the intersection between the support surface of the first section of tubing and a side wall section of the second section of tubing. While holding together the first and second sections of tubing with the filler material, heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material and form the 3t joint.