reg: Maximum interpass temperature in a WPS

[Prince C thomas]

Dear Sir's,

Kindly reply to  my below query:

We have project approved WPS with following details:

Material Spec: ASTM A106 Gr.B

P no:1/Group no:1

Material thickness: 1.5 -14.22 mm

Welding process: GTAW+SMAW

GTAW-Filler wire : ER 70S-2

SMAW-Electrode: E 7018

Preheat - 10 deg minimum

Interpass temp: 200 Deg C Maximum

In the PQR: pre heat temperature:38 deg C

                  Interpass temperature: 68 deg C maximum

Since interpass temperature is not a essential variable (Impact test is not applicable); but still our client is asking to recheck the max.interpass temperature value ( 200 Deg C) in the WPS. How to convince client to get approval on the same?

[Prakash Hegde]

Sir

If client spec addresses the IP temp restriction we have to follow the same Generaly.some of the clients are particular about IP.Heat input as.it controls the properties of weld.Haz Therefore it is better to follow to avoid any any further argument with client 

Hegde

Sent from Yahoo Mail on Android

On Mon, 28 Nov, 2016 at 22:47, Prince C thomas

<prince...@gmail.com> wrote:

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[Mohit Aggarwal]

As far as non essential variable is concern and impact is not required interpass is ok but if client have some requirement mention in their specifications then that should be followed and as thk range 1.5 to 14.22 mm is concerned interpass can be 150 degree also.

Regards,
Mohit Aggarwal.

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[Mhaskar Aly]

Hi Prince,

As Interpass temperature is essential variable for your Client; then keep your interpass temperature as 68 + 55°C ie 123°C as addressed in ASME Sec IX.

Aly

[Kurniatullah Sirajudin]

Dear sir,

Refer to QW-406.8 of ASME sect. IX.

An increase in the maximum interpass temperature of more than 56degC from that achieved on the test coupon and record on the PQR.

In your PQR, interpass is 68degC.
So, max.interpass is 68+55 = 123degC.

Regards
Kurniatullah sirajudin

[MW]

Update:  deleted in 2017 edition