×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Weldability of ASTM A148
2

Weldability of ASTM A148

Weldability of ASTM A148

(OP)
I am wondering how well ASTM A148 - (105-85) Cast Steel can be welded to a CSA 50W plate?  

We are currently welding a ASTM A27 Cast Steel to a 50W plate but would like to upgrade the material.

Thanks in advance.

RE: Weldability of ASTM A148

The A 148 Grade 105-85 is weldable with suitable precautions for preheat and possible post weld heat treatment.

RE: Weldability of ASTM A148

ASTM 148 is a high strength steel casting of weldable grade. However,certain precautions need to be taken before welding.Please refer to the specs. The carbon and Manganese in ASTM 148 are about 0.28% and 1.2% respectively.

RE: Weldability of ASTM A148

(OP)
Thanks for the responses, I have a few more questions.  Yes, sadly I am working Today:

1) Within ASTM A148:  between the different grades, is
90-60 more weldable than 105-85?

2) ASTM A148 does not provide a chemical composition, "Arunmaro" where did you get those values.

3)I came across an interesting formuale for weldability from the ASM Metals Handbook 2nd Ed:

CE = %C + %Mn/6 + %Ni/15 + %Cu/15 + %Cr/5 + %Mo/5 + %V/5

When CE < 0.45%, weld cracking is unlikely and no heat treatment is required


Has anybody used this formuale with confidence.  If so, how can you apply it to ASTM A148

Thanks in advance
 

RE: Weldability of ASTM A148

90-60 is more weldable than 105-85. I got the values, as I make those grades of castings. I intentionally gave you the values as the standard does not specify chemistry or heat treatment,it only specifies the mechanical properties. The foundry and casting user together decide the chemistry.

RE: Weldability of ASTM A148

Yes, typically as the carbon content is lowered because of lower strength requirements the weldability of the steel increases, where preheat and other measures to prevent cracking are less likely.

The carbon equivalent (CE) equation is used to evaluate "weldability" of steel (cast or wrought), where besides carbon content, other alloying elements as arunmrao mentioned are considered. However, to successfully apply the CE equation you need to know the chemical composition of the steels you are joining.

 

RE: Weldability of ASTM A148

(OP)
How much less weldable is 105-85 compared to 90-60?
Can you quantify it, maybe with carbon content of either?
 

RE: Weldability of ASTM A148

With 105-85,you need to add Ni and Mo,some add copper too.Carbon about 0.3-0.32% max and Manganese levels 1.2-1.4% max. The heat treatment cycle varies in each of the 2 cases.

RE: Weldability of ASTM A148

(OP)
Compared to ASTM A27 - 70-36, can you compare weldability.
I noticed the Manganese is less for A27, does that mean it welds better or easier?
 

RE: Weldability of ASTM A148

MechEng1977;
ASTM A 27 is a specification for carbon steel castings for general application. Because of their lower strength, fewer precautions are required for welding, in comparison to higher strength grades, and they are less sensitive to cracking during or after welding.  

RE: Weldability of ASTM A148

(OP)
Assuming all precautions for welding are taken (electrode, heat treat), and the weld is performed properly is the ASTM A148 - 90-60  more robust when compared to ASTM A27 - 70-36?

Or is the 90-60 still more likely to crack in service.  I just want to make sure the switch to the higher grade material will be worth the change.  

Thanks

RE: Weldability of ASTM A148

MechEng1977;
Given your statement above,

Quote:

Assuming all precautions for welding are taken (electrode, heat treat), and the weld is performed properly is the ASTM A148 - 90-60  more robust when compared to ASTM A27 - 70-36?
....

The switch to the higher strength casting only provides more margin for strength, nothing else. The issue of cracking susceptibility does not factor in given the statement above.
 

RE: Weldability of ASTM A148

(OP)
Ok, so taking the engineering approach, I calculated the CE:

ASTM A27 70/36  CE = 0.47

ASTM A148

90/60 CE = 0.48 (Assume no Ni, Cu, and Mo) (C=0.28, Mn=1.2)

105/85  CE > 0.48 (There is Ni, Cu, and Mo how much???)

As for Grade 80/50, and 80/40 do you know the approx chemical comp???


If the above is correct, the 90/60 is as weldable as the 70-36.  The 105/85 is not as weldable by a factor of x

RE: Weldability of ASTM A148

(OP)
The tumbleweed blows across the quiet desert landscape, with nothing in its path it faces a quiet isolation but hopefuly it will find a Material Science Expert to once again help its cause?  Hahah Thanks for listening

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources