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http://www.metallicfusion.com/images/misc/welding%20chart.jpg
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http://www.thedraughtingacademy.co.za/Library/Study_Material/Theory%20Course%20Manuals/SSD/Content/Structural%20Steel%20Detailing%20N5-Index01/01%2042.htm
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http://www.welding.com/weld_symbols_welding_symbols.asp
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http://www.wcwelding.com/welding-symbols.html
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http://www.wcwelding.com/welding-symbols.html
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http://www.thedraughtingacademy.co.za/Library/Study_Material/Theory%20Course%20Manuals/SSD/Content/Structural%20Steel%20Detailing%20N5-Index01/01%2042.htm
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http://www.metallicfusion.com/symbols_and_definitions.htm
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http://www.weldingtipsandtricks.com/full-penetration-weld.html