Lincoln Electric IM724 Common Metals, Joint Types and Positions, For Gmaw MIG Process, Butt Welds

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B-9

 

LEARNING TO WELD

 

B-9

 

 

 

 

 

For GMAW (MIG) Process

1.Is most of my welding performed on 16 gauge and lighter materials?

2.Can I afford the extra expense, space, and lack of portability required for gas cylinders and gas sup- ply?

3.Do I require clean, finished-looking welds?

If you have answered yes to all the above questions GMAW may be the process for you. If you have answered no to any of the above questions, then you should consider using the FCAW process.

For FCAW (Innershield) Process

1.Do I want simplicity and portability?

2.Will welding be performed outdoors or under windy conditions?

3.Do I require good all position welding capability?

4.Will most welding be performed on 16 gauge and heavier, somewhat rusty or dirty materials?

5.Weld must be cleaned prior to painting.

COMMON METALS

Most metals found around the farm, small shop or home are low carbon steel, sometimes referred to as mild steel. Typical items made with this type of steel include most sheet metal, plate, pipe and rolled shapes such as channels and angle irons. This type of steel can usually be easily welded without special pre- cautions. Some steels, however, contain higher car- bon levels or other alloys and are more difficult to weld. Basically, if a magnet sticks to the metal and you can easily cut the metal with a file, chances are good that the metal is mild steel and that you will be able to weld the material. In addition, aluminum and stainless steel can be welded using the K664-1 Aluminum Welding Kit. For further information on identifying various types of steels and other metals, and for proper procedures for welding them, we again suggest you purchase a copy of New Lessons in Arc Welding.

Regardless of the type of metal being welded, in order to get a quality weld, it is important that the metal is free of oil, paint, rust or other contaminants.

JOINT TYPES AND POSITIONS

Five types of welding joints are: Butt Welds, Fillet Welds, Lap Welds, Edge Welds and Corner Welds. See Figure B.11.

Of these, the Butt Weld and Fillet Weld are the two most common welds.

Butt weld

Lap weld

Edge weld

Fillet weld

Corner weld

FIGURE B.11

Butt Welds

Place two plates side by side, leaving a space approx- imately one half the thickness of the metal between them in order to get deeper penetration.

Securely clamp or tack weld the plates at both ends, otherwise the heat will cause the plates to move apart. See Figure B.12.

Now weld the two plates together. Weld from left to right (if right handed). Point the wire electrode down in the crack between the two plates, keeping the gun slightly tilted in the direction of travel. Watch the molten metal to be sure it distributes itself evenly on both edges and in between the plates. This is referred to as the pull technique. On thin gauge sheet metal, use the push technique. See Welding Techniques for GMAW (MIG) Process.

SP-135T

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Contents SP-135T Safety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Please Examine Carton and Equipment For Damage ImmediatelyMaster Table of Contents for ALL Sections Installation Technical Specifications SP-135TIdentify and Locate Components Safety PrecautionsElectric Shock can kill Output Connections Work Clamp InstallationSelect Suitable Location StackingConnecting Gun Cable to the SP-135T GUN InstallationWork Cable Installation GAS ConnectionFigure A.5 Code Requirements for Input Connections Input ConnectionsRequirements For Rated Output General Description Design FeaturesOperation Recommended ProcessesWelding Capability Controls and SettingsLimitations Welding Operations Wire LoadingSequence of Operation Friction Brake Adjustment Wire ThreadingProcess Guidelines Cleaning Tip And NozzleMaking a Weld Welding with Gmaw MIG Changing Machine Over to Feed Other Wire SizesOverload Protection ARC-WELDING Circuit Learning to WeldLearning to Weld SELF-SHIELDED Fcaw Welding ARCGmaw MIG Welding ARC Process SelectionFor Gmaw MIG Process Common MetalsJoint Types and Positions For Fcaw Innershield ProcessPenetration Welding In The Vertical PositionFillet Welds Vertical-down Welding Machine SET UP for the SELF-SHIELDED Fcaw ProcessWelding Techniques for the SELF- Shielded Fcaw Process Correct Welding PositionCorrect Electrical Stickout ESO Correct Welding SpeedHelpful Hints PracticeMachine SET UP for the Gmaw MIG Process Welding Techniques for the Gmaw MIG ProcessFor the SP-135T, use the following To Correct Poor Penetration in order of impor- tance Troubleshooting WeldsTo Eliminate a Ropy Convex Bead in order of importance To Eliminate Stubbing* in order of importanceProper Gun Handling Application Chart K586-1 Deluxe Adjustable Gas Regulator Hose Kit AccessoriesOptional Accessories K549-1 .035 0.9 mm Innershield Welding KitInnershield Fcaw Replacement Parts Conversion Maintenance Safety Precautions MaintenanceRoutine Maintenance For Magnum 100L GUN GUN and Cable MaintenanceConfiguration of Components in Wire Feeding System Contact Tip Cable Liner Drive RollChanging the Contact TIP Component Replacement ProceduresChanging Drive Roll GUN Handle Parts Changing LinerLiner trim length Troubleshooting HOW to USE Troubleshooting GuideProblems Possible Areas Symptoms Misadjustments Recommended Course of ActionContact your local Lincoln Authorized Field Service FacilityWelding Problems Diagrams SP-135T Wiring DiagramSP-135T Precaucion