Re: [MW:27807] Aluminum MIG Welding

Re: [MW:27807] Aluminum MIG Welding - failed PQR

Only pulsed MIG will work and reduce poiristies

Ramin Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE AT 0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

On Tue, May 8, 2018 at 12:23 PM, Adriaan Stoltz <riaan@ritc.co.za> wrote:

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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