Intermittent weld symbol

By Lawrence (*****)

Date 06-09-2016 13:47 Edited 06-09-2016 13:50

Welcome to the Forum Lapenna

AWS A2.4 2012 Standard Symbols for Welding, Brazing, and Nondestructive Examination.

See Clause 8.4.3
Fig 33 (B)

By 357max

Date 06-09-2016 15:01

Also note 6.7 Multiple Reference Lines 6.7.1 Sequence of Operations ..."The first operation is specified on the reference line nearest the arrow." There is no sequence of operations for staggered intermittent fillet welds. ie which weld is placed first.

By SCOTTN

Date 06-09-2016 17:19

Lapenna30,

If you have coworkers that feel "if it's on one side of the reference line, it gets mirrored to the other side as well", they need read AWS A2.4 Standard Symbols for Welding, Brazing, and Nondestructive Examination that Lawrence referenced. It clearly states that "Welds on both sides of the joint shall be specified by placing weld symbols both below and above the reference line."

By welderbrent (*****)

Date 06-09-2016 22:38

Lapenna,

WELCOME TO THE AWS WELDING FORUM!!

The weld symbol only needs to be on both sides of the reference line if the design requires weld on both sides of the joint in question. It NEVER gets mirrored if it is not designated as a triangle (fillet weld symbol) on BOTH sides of the line. It may be a chain or a intermittent but if it is called out. If the Fillet Weld triangle is on both sides then it needs the length/pitch needs to be stated unless it is a continuous fillet AND according to A2.4 Clause 5.4.3 states the length/pitch numbers MUST be on both sides of the line.

Lawrence and others have already referenced you to A2.4. These are not decisions to be based upon personal opinion or guesswork. Go by the applicable codes.

You can also find brief descriptions of weld/welding symbols in many other AWS documents: A3.0 Terms and Defs, several of the code books, WIT, etc.

There, I gave you way too much information instead of making you look it up yourself. BUT, go to the bookstore and get the spec book.

He Is In Control, Have a Great Day, Brent

By 803056

Date 06-10-2016 01:09

The problem is that your coworker probably learned welding symbols when he was a youngster or is referencing a very out dated revision of AWS A2.4.

Prior to the 1976 edition of A2.4, it was acceptable to dimension the weld requirements for the arrow side only if the welding requirements on the "other side" were the same. Notice I said prior to 1976. In 1976 there was a major revision of the welding symbols and how the weld is to be dimensioned. Another source of misinformation includes text book and other references published after 1976 that did not bother to review the changes in A2.4 before publishing. There is one "engineer's reference manual" that showed welding symbols that were 30 years out of sync with the AWS welding symbols when they published their manual. All of which leads to confusion.

Best advice is to secure a copy of the current edition of AWS A2.4 and realize it is an ASNI document and as such, it must be reviewed and reaffirmed or revised by the appropriate subcommittee every 5 years.

Best regards - Al