Questions You Should Know about mma 500 welding machine

Features of MMA 500 Welding Machine

1. Adopt IGBT full bridge inverter circuit

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2. Multi-protection functions provide reliability of welding machine

3. With VRD control functions

4. With ARC start and ARC force current to satisfy functional requests of different type electrode

5. Remote control current adjustment function is applicable at a long distance away from welders

6. Workable with many types of electrodes, such as acidic electrodes, alkaline electrodes, cellulose electrodes, heat resistant steel, etc.

7. Strong ability of anti-fluctuation of power supply, the ratio reaches 15% ( industrial requirement 10%.)

How to choose an MMA Welding Machine?

When selecting an ARC welder, each type meets certain criteria, and unfortunately, no one welding process is suitable for all applications.    

You should always consider:     

● Intended use, is it for occasional maintenance, production or for high-quality welding?    

● What type of material will you weld?    

● How thick is the material you are welding?    

● What power supply can you use?    

● What is the duty cycle of the machine and how will this affect the work you intend to do?    

● By answering all these questions, you are sure to find the MMA Welding Machine that best suits your needs.    

Key Issues of MMA Welding Machine

What is a warm start?     

– Hot start is a special feature of MMA or electrode welding. The machine provides a peak current when striking the arc, which significantly increases the convenience of starting the electrodes. Especially useful when working with imperfect surfaces or when using "hard-to-run" electrodes.    

What is arc force?     

– Sometimes called "digging" or "arc control", it is similar to the hot start function except that it operates during the welding process. It greatly helps to stabilize the arc, preventing it from being cut off during welding and preventing electrodes from sticking, as the machine provides a peak current when it senses a short circuit.    

What is a release agent?     

– Anti-stick is a function that the welder senses when the electrode is stuck and it disrupts the welding current to prevent the electrode from continuing to weld itself to the workpiece, making it easy to separate or break.

Manual Metal Arc (MMA)

Manual Metal Arc (MMA) also known as Shielded metal arc welding (SMAW), also flux shielded arc welding also known as stick welding is the most flexible and one of the most widely used arc welding processes. It involves striking an arc between a covered metal electrode and a workpiece.

The heat of the arc melts the parent metal and the electrode which mix together to form, on cooling, a continuous solid mass. The central metal electrode or core wire acts as a consumable, providing the filler metal for the weld. MMA welding can be used to join most steels, stainless steels, cast irons and many non-ferrous materials. For many mild and high-strength carbon steels, it is the preferred joining method.

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FAQ

What is mig welder?

MIG Welder's outstanding arc performance enables you to achieve professional surface results in welding, automotive bodywork and many other thin steel welding processes. Due to its portable and lightweight design, it is very convenient for users to transport and use in limited spaces. With this welding tool, you can now experience the many benefits of the MMA welding process. This equipment is ideal for welding stainless steel, alloy steel, carbon steel and other metal materials and can be used by amateurs on a daily basis.

what is the advantages of mma arc welder?

Provide excellent arc performance;

With 110V/220V dual voltage;

Ultra-light, compact and portable design;

Overcurrent protection and overload protection ensure safety;

Ideal for light and medium duty daily welding applications;

Closed-loop feedback control, built-in fan and ultra-low voltage intelligent regulator, stable output voltage, easy to start in areas with unstable voltage.

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Advanced IGBT inverter technology features high duty cycle and excellent ignition voltage, making the welder more reliable and less prone to damage or failure.

Energy saving and efficient. Inverter welders also switch very quickly and use less energy to complete the final operation.

An internal cooling fan prevents the welding machine from overheating, extending the life expectancy of the equipment.

Ideal for welding stainless steel, alloy steel, carbon steel and other metal materials.

Other supporting facilities

welding rod welding rod

The welding electrode is a fixed length of straight wire coated with filler material. The welding electrode has a fixing head by means of which the welding electrode is fixed to the welding clamp. The other end of the electrode has a ignition head, and the workpiece is glued to the ignition head to ignite the arc. The quality or trade name of the electrode is marked in the coating near the fixed head. The diameter of the welding electrode refers to the diameter of the metal rod inside the electrode. The purpose of surface coating on metal rods is to protect the welding event from the surrounding air, create slag to support the weld, and make the arc more likely to occur.

how to use mma welder 

Before welding, we must check the condition of the welding power source, cables, welding clamps and grounding clamps. The quality and strength of the welding electrodes must be checked and they must match the workpiece. The coating on the electrode must be intact.

When welding, start the welding by sharply striking the bottom of the groove with the welding electrode. Thereafter, move the welding electrode back to the starting point without stretching the arc and move the electrode easily while monitoring the width of the weld pool. Move the welding electrode so that the handle points forward. The boundaries of the slag formed after melting the weld are visible. It must be located behind the molten weld. The distance between the slag boundary and the molten weld seam can be adjusted by the welding current and the angle of the welding clamp. Throughout the welding process, focus on the length of the arc and keeping it as short as possible. During welding, as the electrode size decreases, the arc length can easily increase. The movements may be a little difficult to control at first, but are easy to get used to. When the welding rod is used up, the slag from the front weld needs to be removed and cleaned with a steel brush. Light the next electrode slightly in front of the previous weld, then move the welding electrode back to the previous weld and continue welding.

After welding, close the welding electrode by moving it slightly back to the completed weld and then lifting the electrode directly away from the workpiece.

20 questions about welding

1. What is welding?

Welding is a family of methods used for joining two workpieces; steel in the case of SSAB. Usually a single heat source, normally an electrical arc, locally melts the two workpieces to form a common liquid pool. When the steel solidifies, the pieces are joined. In many cases, a special steel rod or wire (consumable, filler) is melted into the weld pool to get a good weld joint.

2. What are the most common welding methods?

The most common welding methods are Shielded Metal Arc Welding (SMAW) more commonly known as MMA or stick welding, Tungsten Inert Gas (TIG), Gas Metal Arc Welding (GMAW) more known as MIG/ MAG welding, submerged arc welding (SAW) and laser welding.

3. Can different welding methods be combined?

Yes. A typical example can be to weld the root pass with TIG and fill passes with MIG/MAG. 

4. Can all steels be welded?

Yes, but it is more challenging to weld some steels than others, depending on alloying and dimensions.

5. How can different steels be welded together?

Welding methods and parameters must be suitable for both steels. Usually, the least weldable steel determines the parameters to be used. 

6. What are the welding consumables?

There is a vast number of consumables. The steelmaker provides advice on these for their different grades. For SSAB steels, see the welding recommendations.

7. How is steel preheated before welding?

Workpieces can be preheated in a furnace with an oxy-fuel flame, with electrical heating mats or with electrical induction. It is crucial not to exceed the maximum temperatures given in the data sheet for the steel grade to be welded. Too high a temperature may negatively affect the properties of the steel.

8. How is welded steel postheated after welding?

Steel workpieces can be preheated in a furnace with an oxy-fuel flame, with electrical heating mats or with electrical induction. It is crucial not to exceed the maximum temperatures given in the data sheet for the steel grade involved. Too high a temperature may negatively affect the properties of the steel.

9. How much hydrogen is allowed in the welded joint?

A rule of thumb is a maximum of 5 ml hydrogen per 100 g weld metal. However, this is in practice not possible to measure. The hydrogen content in solid wires for MAG welding is typically around 1.5-2 ml hydrogen per 100 g weld metal, while cored wires can pick up moisture in the flux which might increase to higher values per 100 g weld metal. Keep all consumables dry and warm, in particular flux-covered and flux-core ones. Packages should be opened shortly before use. 

11. What steels can be welded using hardfacing?

Hardfacing is a procedure where a harder material is welded to the base metal surface to create a protective layer. The method can be applied to all SSAB steels, but for the hardest ones, a soft buffer layer must first be welded on the base plate to reduce the risk of cold cracking into the base plate. All types of conventional welding processes can be used for both the buffer layer and the hardfacing layer.

12. Can welding be done on the primer?

Yes, it can. However, the primer will increase the porosity in the welded joint. A high-quality weld calls for complete removal of the primer in the welding area. 

13. How much hardness or strength is lost after heating the material?

Hardness deterioration is difficult to control. The maximum heating temperatures stated in the data sheets of the steel should always be respected.

14. What is the heat-affected zone (HAZ) of steel?

The heat-affected zone (HAZ) is close to the welded joint where the temperature has increased temporarily due to the liquid weld pool. HAZ size depends on the heat applied. The mechanical properties of the base steel in the HAZ may change, usually in a negative direction. 

15. How big should the throat thickness be for fillet welds?

The designer has chosen a suitable plate thickness for the expected structural stresses. A rule of thumb is that the throat thickness is equal to the plate thickness for a one-sided fillet weld. For two-sided fillet welds, the throat thickness should be approx. 0.7 times the plate thickness.

16. Why does the plate deform after welding?

Plate shrinkage in the vicinity of the welded joint will vary due to varying peak temperatures and residual stresses of varying sizes will appear. Thin plates will react with deformation and relaxation of the stresses, while the stresses will prevail in thick plates.  

18. What are hydrogen cracks?

Hydrogen cracks in welded joints can form due to the concentration of hydrogen in the material close to the weld, as hydrogen embrittles the material. Hydrogen atoms in a hot welded joint will diffuse and collect at “comfortable” spots, e.g. microdefects in the microstructure. Hydrogen gets trapped when the joint cools. Cracks can initiate from those hydrogen traps after hours or even days. The inevitable residual stresses will elongate the cracks. High hardness and alloying make steels more sensitive to hydrogen cracking. 

19. What can cause a welded joint to fail?

There are many factors that could cause a welded joint to fail. The most common ones are defects in the form of physical discontinuities, poor microstructure, and residual stresses. There are various reasons behind those factors, including choice of design, joint type, joint geometry, welding process, heat input, preheating, and welding consumables. 

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