Skip to main content

Re: [MW:35894] Reg; C45 Material Welding process (Marine Application)

By Materials & Welding

            Mr. Balaji,

Yours is a C45 material (0.42-0.50% C), Double-V (150*50 mm thick) weld joint. You can use SMAW (E7018 - 3.2/4.0 mm 

size & bake electrodes as required and limit exposure to ambient humidity) for root pass (ground to sound weld metal and 

DP checked later) at the junction.

For the SAW process, use ER80S-G (or equivalent) with a suitable agglomerated flux. For the GMAW process, ER70S-6 

(1.2–1.6 mm size) with 80%A+20% CO2 as shielding gas is suitable.  Alternatively, E71T-1 (for FCAW) or a metal cored 

wire-matched to C45 (for a higher deposition) are recommended.

Preheat the joint to 200–300 °C and maintain an inter-pass temperature within ≤ 250 °C (preferred 200 °C). PWHT at 620 °C 

(range 580–650 °C), hold 1 h per 25 mm thickness on the thickest section → 6 hours for 150 mm, controlled cooling ≤ 50 °C/h 

down to ~200 °C, then air cool. Measure preheat/interpass with a laser gun, carry out hardness mapping (HRC/HV) after welding 

and after PWHT, perform UT as required and maintain records.

Perform a WPS/PQR qualification using your chosen combination (SMAW root + SAW/ FCAW/GMAW fill & cap) and perform mechanical tests as per code.

Weld in balanced sequence (alternate sides/back-to-back) to minimize distortion on the large ring.

 

Hope the above info. will be of help to you.

 

C Sridhar.


On Tue, 11 Nov 2025 at 18:07, Balaji J <balagukan31@gmail.com> wrote:
Dear experts,

        We have do the C45 Material welding process, ID- 1310MM OD- 2200MM x 150MM(THICKNESS) + OD 1306MM X 50MM (Thickness). Double side "V" Groove, Which type welding process suitable Pls suggest & Pre heating , Inter Pass Temp, PWHT method. 

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/3b8f83d4-f4c0-4824-b168-8c398e03d38fn%40googlegroups.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CAHo%3DYig_OuA1waAqw2UZMuRX-1nxmKXAMrWi4n1CfKYEuyWE8Q%40mail.gmail.com.

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more