Certification Process

admin

I have been welding for quite a while and never have been certified.  I mainly weld in the repair aspect.  Looking into it now for strictly for something to do.  On structural certification 3/8 plate is there requirement for the rod diameter. Is it limited to one size or could a person use different sizes.  I know that specifications could be set by the company or specific jobs you are being certified for but i am wondering that in general what is required.  Will be tested by NDT at a local place that does certification.
Reply:Check into it more with your local test facility, there are lots of different certs to be had, it just depends. For mine, 1/8" rod was stipulated.City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:The other question was about the number of passes.  Is there a requirement for that.  I know that larger rod and less passes means better production rate.
Reply:Good question to ask the testing facility.  I halfways did when I picked up the plates and was told that I am the welder and determine that.
Reply:http://deltaschooloftrades.com/certification.htm
Reply:However many passes as it takes to fill the joint...MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Thank you for the information.  I am just looking to finish something I did not finish years ago in vo-tech school.
Reply:Many of the codes or specifications that address welder performance qualification do not dictate the specific details of how the coupon is welded. An internal requirement may exist within a company or a specific code may address what is required.Often times the code may address restrictions on welding in general and in those cases I explain those to the welder and incorporate those into the welder tests. For example, a test in accordance with D1.1 on 1/2" Plate could be filled in one pass after the root pass. The weld could be made with stringers or weaves with no limit on bead width for vertical. Hower if the shop practice is to perform stringers only, I would limit the bead width to stringers.Here is part of the text on the additional information sheets of the WPS. However this is just for informational purposes and is NOT what must be done. This is what I use at the training center for students with the ability to pass welder performance tests in accordance with actual industry codes.This procedure shall be used for performing welder qualification testing on 3/8" to 1/2" thick  material using a Single Vee Groove weld on a backing strip. Test Requirements are 1) Clean all edges of the plates of rust or mill scale using a grinder. If needed, grind bevels to required angle. Remove all mill scale and foreign material from the backing strip.2) Fitup Plate as specified by this WPS and Tack at the ends of the backing strip and on the back of the plate near the center. Have your instructor inspect the fitup.3) Weld a root pass joining the bevelled edges AND backing strip together. Excessive convexity, undercut, or trapped slag may be cause for rejection. Have your instructor inspect the root pass. The root pass thickness shall not exceed 1/4"4) Weld remaining beads up to the last layer prior to the cap layer. Have your instructor inspect the final layer before the cap layer. No individual weld bead shall exceed 3/16" in thickness. Weave beads or stringers may be used however be aware that weave beads may cause problems with excessive starting and stopping within the test plate.5) Allow the plate to cool. Then weld the cap layer. The cap layer must be free of undercut greater than 1/32" deep and be free of overlap or porosity other than at the start of a bead. Weave beads or stringers may be used