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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