By yyq4794
Date 02-02-2013 02:59
Edited 02-02-2013 03:01
This are two sentense shown in my project requirments that:" Tack welds which are incorporated into final welds, i.e., not remelt verified, shall be made with an approved WPS and accepted by the Engineer."
"All tack welds installed under the “remelt provision” shall be qualified by demonstration, macroetch testing as directed by the Engineer. The WPS joint detail shall detail the tack weld and all supporting WPS process information."
My question is as follows
1)What is the difference between tack weld being remelted into the final weld and tack weld incorporated into the final weld?
2)Is remelted tack weld being remelt totally? Is incorporated tack weld just melt a part of it, to shown well fusion between the tack weld and final weld?
3) What does “Tack welds which are incorporated into final welds, i.e., not remelt verified...” means?
I am not saying this is correct, but my interpretation is:
a) Incorporated tack weld: the tack weld is incorporated into the completed weld if the tack weld is not removed before depositing the production weld. Additional weld is “added” to the existing tack weld to extend the weld to the required length and size. The added weld is fused to the existing tack weld.
b) Remelted tack weld: a tack weld that is remelted is incorporated into the final weld when the tack weld is completely consumed by the completed weld. No evidence of the tack weld remains. The tack weld is completely melted and diluted or dissolved into with the production weld.
The photomacrograph of a tack weld that is incorporated into the final weld would be visiable in the cross section. A remelted tack weld could not be seen in the photomacrograph.
Best regards - Al