Author: Amarine Antonio

Shipbuilding and welding professional.
PIPING, WELDING, WELDING METALLURGYLeave a comment

Weld Carbon steel to Stainless steel

Amarine Antonio

It is not uncommon to find fabricating shops that are welding a variety of metals including carbon steel, stainless steel, aluminum, and nickel alloys.  In many cases, some of these materials need to be welded to other types.  Once a very common situation, especially in shipbuilding, oil & gas projects in welding carbon steel to stainless. One of the most frequent questions we receive about this is what filler metal to use.  Welding dissimilar metals can be tricky, especially when you get into the exotic alloys.  Always consult with the manufacturer of the base material or seek the expert advice … Continue reading Weld Carbon steel to Stainless steel

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Demagnetize prior to weld

Amarine Antonio

Knowledge for Reference: Demagnetization: Magnetic field strength above a critical intensity is affecting the weld-ability. Well-known interference are: – Arc welding procedures are sensible to high magnetic field strengths. Welding in presence of magnetic fields may cause magnetic arc blow. Arc blowing is strongly reduced below field strengths of 16 A/cm (=20 Gauss). – In arc welding with filler wires (FCAW/GMAW/SMAW) , sticking of the wire to a side is caused when significant magnetic fields are present. The sticking is minimized below field strengths of 8 A/cm (=10 Gauss). – In electron beam welding (EBW), the quality of the welding is strongly affected by magnetism. At field strengths well below 2 A/cm (=2.5 Gauss) the disturbing influence on welding … Continue reading Demagnetize prior to weld

AWS D1.1 & ASME IX, WELDING1 Comment

PQR – Bending test requirements (AWS D1.1, ASME IX or API)

Amarine Antonio

The bend test is a simple and inexpensive qualitative test that can be used to evaluate both the ductility and soundness of a material. It is often used as a quality control test for butt-welded joints, having the advantage of simplicity of both test piece and equipment. The bend test may be free formed or guided. The guided bend test is where the coupon is wrapped around a former of a specified diameter and is the type of test specified in the welding procedure and welder qualification specifications. For example, it may be a requirement in ASME IX, ISO 9606 and ISO 15614 Part … Continue reading PQR – Bending test requirements (AWS D1.1, ASME IX or API)

CSWIP 3.0/3.1/3.2, Metallurgy, WELDING2 Comments

What is Welding Preheating ?

Amarine Antonio

The phenomenon of heating the joint in the weld zone before the commencement of welding procedure is known as pre-heating. Normally it is applied by the use of ovens, flame producing torch, resistive heating elements and high frequency heating elements. It helps to eliminate welding interruption and several imperfections and set the joining phenomenon on smooth track. Why to use Pre-heat ? Following are the main reasons for using the pre-heat in a welding procedure. The use of Pre-heat, eliminates the surface moisture; consequently reducing the hydrogen induced cracking. It tweaks fusion and deposition of weld metal in a better … Continue reading What is Welding Preheating ?

API 570 - PI, OIL & GAS1 Comment

Can ASTM material use for ASME application.

Amarine Antonio

Under ASME, ASTM materials are NOT automatically accepted. SA designated material should be used at all time ( NOT ASTM A designation), with following exception from Interpretation VIII-1-92-74: Hence, the inspector MUST verify that the Year edition of the ASTM specification detailed on material certification is accepted by the specified edition of ASME code section II, Part A. ASME II Part A details which  ASTM editions for each material are equivalent to ASME SA grade as below extract: Example: ASTM A-36 (2005) is identical to ASME SA-36 (ed. 2007/2008 add) Meanwhile,  the ASTM A737 material is confirmed to be compliant … Continue reading Can ASTM material use for ASME application.

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EN 81-20/50: NEW LIFT STANDARDS

Amarine Antonio

New European Standards – EN 81-1 EN 81-2 Almost 3 years ago, new European standards for the design, manufacture and testing of lifts were introduced. The standards apply to both passenger lifts and passenger goods lifts and come with the catchy names of EN81-20 and EN81-50. The introduction commenced with a three year transition period which ultimately will see the previous standards EN 81-1 and EN 81-2 phased out completely, by 31st of August 2017. From this date any passenger or passenger goods lift placed into service must comply with the new standards. We are now two thirds of the … Continue reading EN 81-20/50: NEW LIFT STANDARDS

API 570 - PI, PIPING2 Comments

FITTING PRESSURE RATING

Amarine Antonio

To be continued from this chapter “Pipe pressure rating“, I’d like to introduce to you about the fitting pressure rating. Note: Flanges, Gaskets, Valves, Weld fittings are designed as CLASS Typically, there’re three type of Fitting CLASS rating: According to ASME B16.5, are made in seven primary Pressure Classes: 150 300 400 600 900 1500 2500 The concept of flange ratings likes clearly. A Class 300 flange can handle more pressure than a Class 150 flange, because a Class 300 flange are constructed with more metal and can withstand more pressure. However, there are a number of factors that can … Continue reading FITTING PRESSURE RATING

OIL & GAS, PIPING3 Comments

ASME B16.5 FLANGE MATERIAL GROUP

Amarine Antonio

ASME B16.5 – List of ASTM Material Specifications MATERIAL GROUP NOMINAL DESIGNATION PRESSURE TEMPERATURE RATING TABLE FORGINGS CASTINGS PLATES 1.1 C-Mn-Si 2-1.1 A350 Gr. LF2 … A516 Gr. 70 C-Mn-Si 2-1.1 … … A537 Cl. 1 C-Mn-Si-V 2-1.1 A350 Gr. LF6 CI. 1 … … 3½ Ni 2-1.1 A350 Gr. LF3 … … 1.2 C-Mn-Si 2-1.2 … A216 Gr. WCC … C-Mn-Si 2-1.2 … A352 Gr. LCC … C-Mn-Si-V 2-1.2 A350 Gr. LF6 Cl. 2 … … 2½Ni 2-1.2 … A352 Gr. LC2 A203 Gr. B 3½Ni 2-1.2 … A352 Gr. LC3 A203 Gr. E 1.3 C-Si 2-1.3 … A352 … Continue reading ASME B16.5 FLANGE MATERIAL GROUP