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weld fillet must be convex, weld joins can be T-joins, weld joins can be corner joins, weld joins can be end to end joins, weld joins can be overlapping joins, TIG welding tips require skills, TIG welding tips can be for weld joins, TIG welding tips can be for material types, TIG welding tips can be for start ups, TIG welding tips can be for position, position refers to work part, position refers to torch, high requency voltage enables arc path, skills can be different, work part can be upright position, work part can be upside down position, work part can be flat position, >45 degrees refers to horizontal axis, upright position requires bottom up travel, TIG welders are different, skills must be learnt, skills must be practiced, different types require different techniques, surface tension to hold molten metal, weld fillet must be equal to metal thickness, weld fillet ensures strong welds, upside down position is the most unsafe, upside down position is the most difficult, rules of thumb are about gas nozzle size, rules of thumb are about electrode extension, rules of thumb are about arc length, <45 degrees refers to vertical axis, high frequency startup prevents contamination, electrode extension is equal to electrode diameter, weld joins are filled with weld fillet, upside down position uses surface tension, start ups can be high frequency startup, TIG welding tips are required for strong welds, electrode extension goes beyond gas nozzle, start ups have rules of thumb, upright position uses surface tension, gas nozzle size is equal to 3 x electrode diameter, high frequency startup is most common, arc length is equal to electrode length, high frequency startup uses high requency voltage, flat position is easier, TIG welders have skills, torch is held <45 degrees, torch is held >45 degrees