Welding waveform for stainless steel applications

Patent metadata

Field	Value
Publication number	US-10974341-B2
Application number	US-201715629195-A
Country	US
Kind code	B2
Filing date	Jun 21, 2017
Priority date	Jun 28, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Specific AC welding waveforms are utilized to increase the toughness level of austenitic stainless steel above what is achieved using the same welding consumables using standard DC welding waveforms.

First claim

What is claimed is:

1. An arc welding system, comprising:
a welding power source which generates a welding output for performing a welding process on stainless steel, the welding output having an AC welding output current;
an L-grade stainless steel welding electrode; and
a controller coupled to said welding power source which controls the welding power source to generate the welding output to said welding electrode, wherein the AC welding output current is biased toward DC negative such that the welding output has a negative effect of less than 100 per equation #1;

Negative
⁢

⁢
Effect

=

[

0.7
*

(

I

p
,
p

*
B

-

I

p
,
n

*

(

100
-
B

)

100

)

*

(

I

p
,
p

+

I

p
,
n

)

+

0.3
*

(

V

p
,
p

*
B

-

V

p
,
n

*

(

100
-
B

)

100

)

*

(

V

p
,
p

+

V

p
,
n

)

]

*

(

1
1000

)

Equation
⁢

⁢
#1

wherein:
B is a percentage of time said welding electrode is positively charged;
I p,p is a peak current in an electrode positive polarity of the welding output;
I p,n is a peak (absolute) current in an electrode negative polarity of the welding output;
V p,p is a peak voltage in the electrode positive polarity of the welding output; and
V p,n is a peak (absolute) voltage in the electrode negative polarity of the welding output, and

wherein the controller is configured to one or both of: determine the negative effect of a welding waveform, and receive the negative effect as a set point.

2. The system of claim 1 , wherein the negative effect is in a range of −700 to 100.

3. The system of claim 1 , wherein the negative effect is in a range of −700 to 0.

4. The system of claim 1 , wherein the negative effect is in a range of −100 to 100.

5. The system of claim 1 , wherein

Assignees

• Lincoln Global Inc

Inventors

• Melfi Teresa
• Mcvicker Nathaniel

Classifications

• B23K2103/05

  Stainless steel · CPC title

• B23K9/18 Primary

  Submerged-arc welding · CPC title

• B23K9/095

  Monitoring or automatic control of welding parameters · CPC title

• B23K9/1006 Primary

  Power supply · CPC title

• B23K9/092 Primary

  characterised by the shape of the pulses produced · CPC title