Reasons to avoid a lap weld???

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Aside from being limited by joint thickness, are there other reasons to avoid a lap weld?
Reply:All lap joints use a fillet weld.  A lap joint is quite practical and is common in industry.  Just keep in mind that in straight tension across the joint, the stress does not go through a lap joint in a straight line.  A lap joint allows one to put in an easy fillet weld.  An open vee butt joint is difficult and requires a full penetration groove weld in most cases.
Reply:Originally Posted by WeldgirlAside from being limited by joint thickness, are there other reasons to avoid a lap weld?
Reply:Thanks Sandy.. I didn't even know they used the term "Lap Weld"  at all.  From what I can tell it is a reference to sheet metal joining.  I notice latest publications call these type of lap joints using "Seam Welds"
Reply:You have to weld it from both sides if it's structural.
Reply:I looked up in an old 1956 Lincoln Procedure Handbook and there is a complete unit describing "lap welds"  It is an archaic use.  To separate and clarify the term "lap" is used to describe a joint.  The weld in present day usage is a fillet weld.  The reference to porosity from a "lap weld" in my '73 handbook is for submerged arc welding.  Sub arc is very sensitive to gases between layers blowing through.  I get the feeling Weldgirl that some of the terms you are being asked about have been replaced.   Odd questions.  I would be interested in the correct answers when you find out.
Reply:The reference to porosity from a "lap weld" in my '73 handbook is for submerged arc welding. Sub arc is very sensitive to gases between layers blowing through.
Reply:What I find interesting Sandy is the massive section about "lap welds" in the '56 edition.  It is in a section titled Sheet Metal Procedures and deals with stick welding of thin material.It is fun to collect old texts and compare :'))
Reply:I have the feeling that while my instructor can weld fantastically, paperwork is not his favorite part of the job! I have class tonight and will ask him if that is the correct term or just what really meant. Some of the written homework we got was printed in 1995 and I am wondering if anyone has even looked at it since then! I will find out and let you all know since you took the time to reply to me! Thanks for the help!