Exhaust Pipe Weld Joint Diagram - Acceptable vs. Preferred Slip Joint Direction

This is a hand-drawn schematic illustrating correct and incorrect methods of welding exhaust pipe joints, particularly where two pipes of different diameters are connected. A legend identifies red lines as welds, and an arrow labeled 'EXHUAST GAS FLOW' (sic) shows the direction of exhaust gas travel. Three joint configurations are shown: (1) ACCEPTABLE: the smaller upstream pipe slips inside the larger downstream pipe so gas flows smoothly from small to large; (2) UNACCEPTABLE: the joint is arranged so the overlap faces into the gas flow, creating a lip/edge against the flow direction; and (3) PREFERRED: the smaller pipe is spread (flared) to match the larger pipe, or a reducer is smoothly connected at each end, producing a smooth transition. A note explains that a smooth transition presents no problem no matter which way the gas flows. The document teaches exhaust fabricators how to orient slip-joint welds relative to exhaust flow to avoid flow disruption. It contains no vehicle-specific information, part numbers, dates, or measurements, it is a generic exhaust fabrication technique diagram applicable to any vehicle, uploaded in the context of a 2000 Ford Crown Victoria.