Was the correct "former" diameter used for the bend tests? Also, where did the tensiles break?
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Hani Al Masry
Sent: 07 May 2018 08:22 AM
To: materials-welding@googlegroups.com
Subject: [MW:27789] Aluminum MIG Welding - failed PQR
Dear experts
regarding A/M Subject kindly advice why the PQR Test had been failed two times even this WPS/PQR Approved before and we just tried to copy it
all welders 2 times failed in root bend / tension some times not reach 250 MPA as required (2 root bend + 2 root face + 2 tensile testing are required)
the lab said first time there are porosity
and inclusions but even 2nd test was failed (attached photos for your reference)
BASE METAL : AA 5083 H 321
FILLER METAL : ER 5356
Joint Preparation: - Single V CPJ
| Weld Layer | WELDING PROCESS | WELDING POSITION / DIRECTION | ELECTRODE(S) | GAS SHIELD | GAS FLOW RATE lit/min. | AMPS | VOLTS | WELDING SPEED mm./min. | FLUX | WFS M/Min. | Mode of Metal transfer for MAW | ||
| SIZE mm | TRADE NAME | POLARITY | |||||||||||
| 1 | GMAW | 3G | 1.2 | AUTO ROD 5356 | DCEP | ARGON 99.99% | 15-25 | 120-180 | 18-26 | 12-20 | NA | 8.5 | Pulse transfer |
| 2 | GMAW | 3G | 1.2 | AUTO ROD 5356 | DCEP | ARGON 99.99% | 15-25 | 120-180 | 18-26 | 120 - 140 | NA | 8.5 | Pulse transfer |
| Back weld | GMAW | 3G | 1.2 | AUTO ROD 5356 | DCEP | ARGON 99.99% | 15-25 | 120-180 | 18-26 | 100 - 110 | NA | 8.5 | Pulse transfer |
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