Acording to AWS D1.1 section 2.2.4.1, it is recommended that contract design drawings show complete joint penetration or partial joint penetration grove weld requirements without specifying the grove weld dimensions.
Reference Line must always be horizontal,
A welding symbol consists of 3 basic elements: Reference line, Arrow and Tail as shown below:
From metallicfusion.com
Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area. The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.
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