Cwb smaw welding test coupons

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AWS D1. Welding Process. Up Joint Type. Butt Backing. Yes Backing Material. No Base Metal. Steel Thickness. E Electrode Diameter. Either Multi-Pass or Single Pass per side. Multiple Interpass Cleaning. Test coupons with mill scale ground back a minimum of 1 inch or Checking the bevel with a protractor to make sure each bevel is Tacking the backing bar to the test coupon. Once the coupons were tacked lightly and fell within the tolerances I finally added the middle tacks while the test coupon was in a vice to avoid distortion.

Checking the position of the 3G weld test to make sure it is completely vertical. Just illustrating the proper position of 3G weld test. The test coupon is in position and the Certified Welding Inspector marks a white line to make sure the position does not change and you do not sheat. Side view of the test coupon after the CWI marked it in position. The first E electrode used to start the root pass with the slag still covering. Second electrode used on the root pass. Just cleaned the second fill of the root pass using a wire wheel on my grinder.

The root pass is finally finished and slag still covering before chipping and cleaning. Side view of the slag for the E electrode. This is done because it is in the welding procedure and in the words of the American Welding Society: Finally cleaned the root pass with a wire wheel and the Certified Welding Inspector needed to inspect the root because the welding certification procedure required it and It passed.

The root pass ground down flat. First weld of the fil pass with the slag still covering. Here is the fill pass cleaned with a wire wheel. Here is the second part of the fill or hot pass with the slag covering. Side view of the slag on the fill pass.

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Third electrode used for the fill pass with slag still covering. Forth electrode used to complete the fill pass. Fill pass ground flat and ready for cap weld. Weave Techniques for Vertical Up Cap Cover Pass Weld The cap was done using a weave technique holding the corner of the bevel until it was filled and the moving onto the other side. Starting the cap weld using the weaving technique with the slag still covering. Here is the start of the cap cleaned. The second electrode used on the cap with slag covering. The second electrode used and the weld cleaned.

Bend testing

The third electrode used for the cap weld with slag covering. The third weld of the cap cleaned. Finally finished the cap and it still is covered in slag. Finally finished welding the cap and it is now cleaned ready to inspect. This is where I held my electrode on the left. Once it filled I slowly moved to the right. This is just like the left side. Weld Test Coupon Marking and Cutting It is now the next day since taking the test and the plate has had more than enough time to cool.

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Here I am marking the test coupons for a root, face and alternative bend coupons. The Certified Welding Inspector engraved my initials and the weld procedure test number with a etchall. Cutting Test Coupons The test coupons are cut on a band saw. The cutting begins on the horizontal bandsaw. The test coupons are cut and ready for the backing bar removal. Gouging the backing bar with a grinding wheel so the tabs can be broken off. Here is the test coupon with the backing bar removed. Weld Reinforcement Removal Before grinding down the root and cap of the weld I took a center punch and marked the center of the weld.

Here are the face and root bend coupons ready to bend. Welding Certification Bend Test I will have two bends done. The root bend specimen about to go into the bender. The root bend specimen is half way through the bend. The root bend specimen passed the bend test. Face Bend Test Here is the specimen for the face bend, followed by the bending, and finally successfully passing the face bend test. The face bend specimen ready to bend. The face bend specimen is half way through the bend test.

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Org , Proudly powered by WordPress. More Info. Stay In Touch Twitter Facebook. Most specifications regard a defect over 3mm in length as being cause for rejection. For butt weld procedure and welder qualification testing the bend coupons may be oriented transverse or parallel to the welding direction. Below approximately 12mm material thickness transverse specimens are usually tested with the root or face of the weld in tension. Material over 12mm thick is normally tested using the side bend test that tests the full section thickness, Fig.

Where the material thickness is too great to permit the full section to be bent the specifications allow a number of narrower specimens to be taken provided that the full material thickness is tested. Conventionally, most welding specifications require two root and two face bend coupons or four side bends to be taken from each butt welded test piece. The transverse face bend specimen will reveal any defects on the face such as excessive undercut or lack of sidewall fusion close to the cap. The transverse root bend is also excellent at revealing lack of root fusion or penetration.

The transverse side bend tests the full weld thickness and is particularly good at revealing lack of side-wall fusion and lack of root fusion in double-V butt joints. This specimen orientation is also useful for testing weld cladding where any brittle regions close to the fusion line are readily revealed.

Longitudinal bend specimens are machined to include the full weld width, both HAZs and a portion of each parent metal. They may be bent with the face, root or side in tension and are used where there is a difference in mechanical strength between the two parent metals or the parent metal and the weld. The test will readily reveal any transverse defects but it is less good at revealing longitudinally oriented defects such as lack of fusion or penetration. Whilst the bend test is simple and straightforward to perform there are some features that may result in the test being invalid.

Keep in touch throughout the week thanks. By Lawrence Date Edited This is going to be easier than you think First Welcome the forum The single bevel test is the way it is for a very important reason This test assembly requires you to make a fillet weld!

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Also a groove weld.. All at the same time.

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The non-beveled edge is the one giving you trouble today eh? Well young man Forget weaving or whipping They always do this, so don't be nervous, just get used to it. So back to the undercut Just practice some fillets in the same position as the test eh? Practice controlling your rod angle and travel speed to decrease the undercut, keep the arc length short to also help with the undercut. It's a little bit different than an AWS test But not really harder This makes it a bit more important to watch your arc length, travel speed and rod angles, so that you don't make your weld too large on that first fillet But you have an extra wide root opening so your rod will fit into the groove with ease Again just practice fillets in the same orientation as the test Getting the size and profile you like.