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AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire

1. AWS A5.20 E71T-1C & E71T-1M is a type of flux-cored welding wire. 
2. Signifies minimum tensile strength 70,000psi (or71ksi).
3. Can be used for welding in all positions ( overhead...).
4. The "T" denotes that it is a tubular wire, specifically a flux-cored one.
5. The final "1" indicates its usability characteristics,(DCEP) polarity.
6. This wire is for welding mild steel and 490 MPa (or 71,000 psi) class steels.
7. E71T-1C Requires a CO2 gas shield,E71T-1M can use an ar/CO2 mixed gas.
  • E71T-1C & E71T-1M

  • 1kg,5kg,15kg,20kg

  • 1lb;2lb;4.5lb;11lb;15lb;20lb;33lb;44lb

  • 0.6mm;0.8mm;0.9mm;1.0mm;1.2mm;1.6;2.0mm

  • 0.023;0.030in;0.035in;3/64″;0.045;1/16″;5/64″

  • D100,D200,D270,D300,BS300,K300

  • Acceptable (design the pack with your logo)

  • 15 Days

  • Welding Wire Catalogue-giant weld.pdf

Availability:
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Product Description

| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Description


1)Fundamental Classification: Both AWS A5.20 E71T-1C and E71T-1M are classifications for gas-shielded flux-cored arc welding (FCAW) wires. The "E71T-1" portion of the classification remains consistent, indicating an electrode (E), a minimum tensile strength of 70,000 psi (7), all-position welding capability (1), and a tubular, flux-cored design (T) with similar usability characteristics (1) to the broader E71T-1 class. The key distinction lies in the trailing letter "C" or "M", which specifies the required shielding gas.

2)E71T-1C Specifics (100% CO2 Shielding): The "C" in E71T-1C denotes that the electrode is specifically designed and classified for use with 100% Carbon Dioxide (CO2) shielding gas. This combination typically results in deep penetration, a relatively stable arc, and good mechanical properties for welding mild and 490 MPa (or 71,000 psi) class high-strength steels. While effective, the 100% CO2 shielding can sometimes lead to slightly more spatter and a coarser bead appearance compared to mixed gases.


3)E71T-1M Specifics (Mixed Gas Shielding): The "M" in E71T-1M indicates that the electrode is classified for use with a mixed shielding gas, typically an argon/CO2 blend (e.g., 75-80% Argon and balance CO2). The addition of argon to the CO2 significantly improves arc stability, reduces spatter, and enhances bead appearance, often resulting in a smoother, finer arc transfer. This mixed gas operation can also lead to higher tensile and yield strengths and improved impact toughness, particularly at low temperatures.


4)Welding Performance Differences: While both wires offer all-position capability and good mechanical properties, E71T-1M generally provides superior operator appeal due to its smoother arc and less spatter. E71T-1C is known for its robust performance and deeper penetration, which can be advantageous in certain applications. The choice between them often depends on the specific requirements of the welding procedure, desired bead aesthetics, and the shop's preferred shielding gas setup.


5)Mechanical Property Variations: Although both classifications meet the minimum 70,000 psi tensile strength, the shielding gas choice can subtly influence the final mechanical properties. E71T-1M, when used with argon-rich mixed gas, often yields weld metal with slightly higher tensile and yield strengths, along with potentially better low-temperature impact toughness, due to increased alloy recovery and a more stable arc. E71T-1C, with 100% CO2, tends to offer good ductility and crack resistance.


6)Typical Applications and Selection: Both E71T-1C and E71T-1M are extensively used in applications such as structural steel fabrication, shipbuilding, pressure vessel manufacturing, and general heavy fabrication. The decision to use -1C or -1M often comes down to the specific welding codes, desired productivity levels, and the availability of shielding gases. E71T-1M is often favored for its improved usability and aesthetic finish, while E71T-1C remains a cost-effective and reliable option for many general fabrication tasks.


| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Down Load


AWS A 5.20 E71T-1 Flux Cored Welding Wire.pdf



| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Data Sheet

Standard

AWS A5.20

E71T-1C/E71T-1M

Chemical Composition %


C

Mn

Si

P

S

Cr

Ni

Cu

Mo

V

Grade

E71T-1C/E71T-1M

0.12

1.75

0.90

0.03

0.03

0.20

0.50

0.35

0.30

0.08

Type

Spool  ( MIG )

Specification

 ( MM )

0.80.91.01.21.62.0

Package

S100/1kg  S200/5kg   S270,S300/15kg-20kg

X - ray detection requirements

Deposited metal diffusible hydrogen 

(Chromatography or Mercury):≤10ml/100g

Mechanical Properties

Yield Strength  

(Mpa)

Tensile  (Mpa)

Elongation  (%)

AKV Impact Energy(J)  -20

390

490 670

22

27

MIG

Welding

 

Current - A

DiameterMM

1.0

1.2

1.4

1.6

Downward welding

80  250

120  300

140  400

180  450

Vertical upward welding


120  260

150  270

180  280

Vertical down welding


200  300

220  300

250  300

Horizontal welding


120  280

150  320

180  350

Diameter Process
in mm
0.023 0.6 GMAW
0.03 0.8 GMAW
0.035 0.9 GMAW
0.039 1.0  GMAW
1/25.4”
0.045 1.2 GMAW
3/64”
1/16” 1.6 GMAW

AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Packages
Weight 0.5kg 1kg 2kg 5kg 15kg 20kg
1 lb 2 lb 4 lb 11 lb 33 lb 44 lb



| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Workshop

AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire


| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Video



| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Application

AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire



| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Certificate

AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire



| AWS A 5.20 E71T-1C & E71T-1M Flux Cored Welding Wire Comment & FAQ


Q1: What are the fundamental differences between AWS A5.20 E71T-1C and E71T-1M?

The core difference between **AWS A5.20 E71T-1C** and **E71T-1M** lies in their designated shielding gas requirements. The "C" in E71T-1C indicates that it is specifically formulated and tested for use with 100% **CO2 shielding gas**. Conversely, the "M" in E71T-1M signifies its classification for use with a **mixed shielding gas**, typically an Argon/CO2 blend. This distinction significantly impacts arc performance, spatter levels, and the final mechanical properties of the weld.


Q2: Why choose E71T-1C over E71T-1M, or vice versa?

Choosing between **E71T-1C** and **E71T-1M** often depends on your specific welding needs, equipment setup, and desired weld characteristics. **E71T-1C** is generally more cost-effective as CO2 is a cheaper shielding gas and provides excellent penetration, making it ideal for heavier sections and where deep fusion is critical. **E71T-1M**, on the other hand, offers a smoother arc, less spatter, and improved bead appearance due to the mixed gas, leading to less post-weld cleanup and superior aesthetics, often preferred for visible welds or where productivity gains from reduced spatter are highly valued.


Q3: How does the shielding gas affect the arc characteristics and spatter with E71T-1C and E71T-1M?

With **E71T-1C** and 100% CO2, the arc tends to be stiffer and more penetrating, which can sometimes result in higher spatter levels and a slightly harsher arc sound. The arc column is narrower, leading to a more focused heat input. For **E71T-1M** with an Argon/CO2 blend, the arc is typically softer, more stable, and produces significantly less spatter. The argon helps to smooth the metal transfer, resulting in a quieter operation and a visually cleaner weld bead, enhancing overall **welder productivity**.


Q4: Are there differences in mechanical properties between welds made with E71T-1C and E71T-1M?

While both **E71T-1C** and **E71T-1M** meet the same minimum tensile strength of 70,000 psi, **E71T-1M** welds often exhibit slightly higher tensile and yield strengths and improved low-temperature impact toughness. This is largely attributed to the improved deoxidization and alloy recovery achieved with the mixed gas shielding, which can lead to a finer microstructure in the weld metal. For critical applications requiring enhanced toughness, **E71T-1M** might be the preferred choice.


Q5: Can E71T-1C and E71T-1M be used interchangeably?

No, **E71T-1C** and **E71T-1M** cannot be used interchangeably without switching the shielding gas. Using an E71T-1C wire with mixed gas or an E71T-1M wire with 100% CO2 will likely result in poor arc stability, excessive spatter, incomplete fusion, and compromised mechanical properties. Always match the **welding wire** to its specified shielding gas to ensure optimal performance and code compliance.


Q6: Which wire, E71T-1C or E71T-1M, offers better out-of-position welding capabilities?

Both **E71T-1C** and **E71T-1M** are classified for all-position welding, meaning they perform well in flat, horizontal, vertical, and overhead positions. However, due to its smoother arc and better puddle control, **E71T-1M** often provides an advantage for welders performing significant amounts of out-of-position work, particularly vertical-up and overhead. The reduced spatter also makes these positions less fatiguing for the operator.


Q7: How do E71T-1C and E71T-1M handle mill scale and contaminants?

Both **E71T-1C** and **E71T-1M** are generally robust and exhibit good tolerance to mill scale and moderate surface contaminants, a common characteristic of **flux-cored welding wires**. The fluxing agents within the wire help to clean the weld pool. However, for optimal **weld quality** and to prevent defects like porosity, it's always recommended to thoroughly clean the base metal prior to welding, regardless of the wire type.


Q8: What are the typical deposition rates for E71T-1C and E71T-1M?

Both **E71T-1C** and **E71T-1M** offer high deposition rates compared to stick electrodes or solid wire, making them excellent choices for high-production welding. The specific deposition rate will depend on the wire diameter, welding parameters (voltage, wire feed speed), and position. Generally, flux-cored wires are chosen precisely for their ability to lay down a lot of weld metal quickly and efficiently, boosting **welding productivity**.


Q9: Is one type of wire preferred for automated welding processes?

For **automated welding processes**, both **E71T-1C** and **E71T-1M** can be highly effective. The choice often comes down to the desired weld aesthetics and post-weld cleanup requirements. **E71T-1M**'s lower spatter and smoother bead can reduce the need for robotic grinding or chipping, potentially optimizing cycle times in automated cells. However, **E71T-1C**'s deep penetration can be an advantage in certain high-speed automation scenarios.


Q10: Do E71T-1C and E71T-1M require specific welding techniques?

While the fundamental **welding techniques** for FCAW remain consistent (e.g., drag angle, maintaining proper stickout), subtle adjustments might be beneficial when switching between **E71T-1C** and **E71T-1M**. The stiffer arc of E71T-1C with CO2 may benefit from a slightly more pronounced drag angle, whereas the smoother arc of E71T-1M allows for more flexibility. Consistent stickout is crucial for both to maintain arc stability and control.


Q11: How do hydrogen levels compare between E71T-1C and E71T-1M?

Both **E71T-1C** and **E71T-1M** are designed to produce weld metal with low diffusible hydrogen content, which is crucial for preventing **hydrogen-induced cracking** in susceptible steels. The flux formulation plays a significant role in this. While specific numbers can vary by manufacturer, both classifications are considered low-hydrogen electrodes for their respective shielding gas combinations.


Q12: Are there any specific industry codes or standards that favor one over the other?

Many **welding codes and standards**, such as AWS D1.1 for Structural Welding Code – Steel, will specify acceptable electrode classifications for certain applications. Both **E71T-1C** and **E71T-1M** are widely accepted for structural welding and general fabrication. The choice often depends on the specific project requirements, customer specifications, and preferred **welding consumables** by the fabricator, rather than a blanket preference by the code itself.


Q13: Can these wires be used for pulse welding?

While traditional **FCAW** with E71T-1C and E71T-1M typically uses conventional CV (Constant Voltage) power sources, some newer power sources with advanced waveform control might offer pulsed FCAW capabilities. Pulsed welding can further enhance arc stability, reduce heat input, and improve out-of-position control. However, it's critical to verify if the specific **flux-cored wire** is designed or recommended by the manufacturer for pulsed applications.


Q14: What impact does humidity have on the performance of E71T-1C and E71T-1M?

High humidity can negatively impact the performance of both **E71T-1C** and **E71T-1M** if the wire is not stored properly. Moisture absorption by the flux can lead to increased porosity and potential hydrogen cracking in the weld. It's crucial to store these **welding wires** in a dry, climate-controlled environment, ideally in their original sealed packaging, to maintain their integrity and ensure optimum **weld quality**.


Q15: How does contact tip life compare between using E71T-1C and E71T-1M?

Contact tip life can be influenced by several factors, including wire diameter, amperage, and cleanliness of the wire. Generally, the smoother arc and lower spatter associated with **E71T-1M** (due to mixed gas) might lead to slightly extended contact tip life compared to **E71T-1C**, as there's less material buildup at the tip. However, proper maintenance and selecting the correct tip size are critical for both.


Q16: Are there specific training requirements for welders using E71T-1C versus E71T-1M?

While the fundamental **FCAW skills** are transferable, welders often find **E71T-1M** with mixed gas more forgiving and easier to use due to its smoother arc and lower spatter. Training for **E71T-1C** might emphasize techniques to manage its stiffer arc and higher spatter. Proficiency in either classification requires dedicated practice and understanding of their unique characteristics to achieve consistent **weld quality**.


Q17: Can these wires be used for root pass welding?

Both **E71T-1C** and **E71T-1M** can be used for root pass welding in certain applications, especially on thicker materials or with specific joint designs where the penetration characteristics of flux-cored wire are beneficial. However, for open root joints or very thin materials, solid wire (GMAW) or stick (SMAW) may still be preferred for better root control and less cleanup on the backside. Always consult the welding procedure specification for guidance on **root pass welding**.


Q18: What are the typical electrode stickout recommendations for E71T-1C and E71T-1M?

The typical **electrode stickout** (the distance from the contact tip to the end of the wire) for both **E71T-1C** and **E71T-1M** usually ranges from 3/4 inch to 1 1/4 inches (19-32 mm). Maintaining a consistent stickout is crucial for stable arc performance and achieving consistent weld penetration and bead shape. Varying stickout can impact arc voltage and ultimately affect **weld quality**.


Q19: How do pricing and availability compare for E71T-1C vs. E71T-1M?

Generally, **E71T-1C** might be slightly more economical in terms of raw material cost, and 100% CO2 shielding gas is usually cheaper than Argon/CO2 mixes. This can make E71T-1C a more budget-friendly option for high-volume work. Both classifications are widely available from major **welding consumable** manufacturers, so supply shouldn't be an issue. The total cost of ownership also includes factors like post-weld cleanup, which might favor E71T-1M in some cases.


Q20: What are common reasons for unsatisfactory welds with E71T-1C or E71T-1M?

Unsatisfactory welds with **E71T-1C** or **E71T-1M** often stem from incorrect **welding parameters** (voltage, wire feed speed, travel speed), improper shielding gas selection (e.g., using 100% CO2 with E71T-1M), inadequate shielding gas flow, or poor base metal preparation. Other issues can include improper stickout, worn contact tips, or excessive weave. Troubleshooting these factors systematically, often with guidance from the **welding wire** manufacturer's technical data sheet, is key to improving **weld quality**.


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